Malicious PDF — malware analysis report

Static analysis result for SHA-256 544c6eab6e8f670d…

MALICIOUS

PDF

106.6 KB Created: 2021-03-22 20:55:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 1608c65615480b8adaade6123950dc13 SHA-1: 05d6e8947527e5de036b6925e10d4594c8b3d7fb SHA-256: 544c6eab6e8f670dd6717203946be81230162aec6212406c527af772d65595bd
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external links, many pointing to disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery. While no scripts were directly extracted, the PDF structure and embedded links are indicative of a lure to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://bologen.ru/wix?keyword=touchstone+sb6121+user+guide PDF link annotation
    • http://julajaz.22web.org/fisel.pdfIn PDF document text
    • https://cdn.sqhk.co/dabozijide/iihbjbu/zesifojebularafud.pdfIn PDF document text
    • https://cdn.sqhk.co/jerivudofin/cKhcvtV/zombie_city_defense_apk.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/31291b78-18fc-4d93-ab9e-162d5ce55f96/best_speakers_for_audio_technica_lp60.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dafb60d1-a9df-403d-a981-d89c4ce1b689/82672418738.pdfIn PDF document text
    • https://aa5f33e9-793b-4807-a257-9eac84d314d0.filesusr.com/ugd/aa57b2_c8bb43072f0f460e81ede1e93eac9b53.pdf?index=trueIn PDF document text
    • https://18b62485-dce0-4e35-9712-b1d1f13fcb23.filesusr.com/ugd/296484_9c99c18871264e3ebad1d70093c3bf48.pdf?index=trueIn PDF document text
    • https://f0198b83-f3fe-41b4-8315-bacd7eabb238.filesusr.com/ugd/2b3f46_107d2960be924784a3e55784ca28a1c3.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lofese/what_building_was_the_treaty_of_guadalupe_hidalgo_signed.pdfIn PDF document text
    • https://0c1adbbe-b65a-4c28-9da2-87cea21e0636.filesusr.com/ugd/496951_0ef41564b4154f5082cb53783c366b5a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/bc1df6b8-e16f-41dd-958b-c76910802331/4843542130.pdfIn PDF document text
    • http://kifobidurusidi.epizy.com/domevaleruzukukafida.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2be374a2-c5e9-43fa-adb9-9bb596802e26/ethiopian_bible_88_books.pdfIn PDF document text
    • http://zobovobewuw.epizy.com/26098035114.pdfIn PDF document text
    • https://1fc3e790-19e1-43b7-bae7-d09a953f51fe.filesusr.com/ugd/2c608b_4a238e5204b64f81840f732f62514d59.pdf?index=trueIn PDF document text
    • http://pokezuturev.rf.gd/watchman_nee_biografia.pdfIn PDF document text
    • https://s3.amazonaws.com/dexodekelaseki/free_template_html_shop.pdfIn PDF document text
    • https://08b4a39d-fa16-4eaa-91be-ae90003cacb9.filesusr.com/ugd/237bf7_58d62157e67c45d59ad86caffc483190.pdf?index=trueIn PDF document text
    • https://041c2bdd-267b-4995-9d72-d071cf2c2b2b.filesusr.com/ugd/ba0b69_66cae4a9985d479f85af698951509b90.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/07358807-7ef3-49d7-9723-0b4e891ff55f/how_to_get_a_drivers_license_in_colorado.pdfIn PDF document text
    • https://e2604e0b-f95a-4acb-b53f-a7db3827b2a1.filesusr.com/ugd/225520_e7932f24583a483281dcb9b9b08cb159.pdf?index=trueIn PDF document text
    • https://6e8b94c7-278c-4a65-9c30-8d61c93a8f31.filesusr.com/ugd/9ff9b8_b328d0bfef8f4831af8c3f7f63c79e29.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vajefam/pokemon_y_post_game_guide.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012b5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B5D 6440 bytes
SHA-256: edf517a561ed5132c6c1d5718ac6ff9d870a00e6f43a91762fd168a2279cca75
font_01_sfnt_off00013b53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B53 5388 bytes
SHA-256: e7f276bb0649d87d40a5d66d24f4b4681f8aafc98503f23bc9f364e035f9f899
font_02_sfnt_off00014d9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D9D 7424 bytes
SHA-256: df8f29d9f73945b5ada13fc4a841f260db18488cb03ba163490a5044913d7c3f
font_03_sfnt_off00015e74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15E74 11084 bytes
SHA-256: 18be67dca14177fc5e571ceb9bed911bfdba5cd6a3735f6f6215ca09efb8b2f1
font_04_sfnt_off0001845c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1845C 16764 bytes
SHA-256: 89a6ca54cd8931cefa3f5c191b058f996d225891aa666e3ae2a7d60d134bbd5d

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