Malicious PDF — malware analysis report

Static analysis result for SHA-256 0618bdc0decb38ab…

MALICIOUS

PDF

87.2 KB Created: 2021-03-31 22:51:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: bd1e61f34e3baced0936ed233a1c744f SHA-1: 26a301dcf88dcc202d80d9c8a6c881302ddf0b60 SHA-256: 0618bdc0decb38ab4054f96e4181028cd7ce16a32c1eb0fbf293cbd6c2482b39
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating it functions as a link farm. This is a common tactic for distributing phishing lures or directing users to exploit kits. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://xajibur.ru/award?keyword=amiodarona+efectos+adversos+pdf PDF link annotation
    • https://zosotise.weebly.com/uploads/1/3/5/3/135393527/1571078.pdfIn PDF document text
    • https://cdn.sqhk.co/junigofulum/hhcrghf/chemical_bonding_questions_and_answers.pdfIn PDF document text
    • https://cdn.sqhk.co/jomenuluz/ti3tPjg/27728470625.pdfIn PDF document text
    • https://cdn.sqhk.co/fakupavod/zhbEgi8/22963713294.pdfIn PDF document text
    • https://cdn.sqhk.co/gunonutib/jiciiji/woodworkers_source_in_tucson_hours.pdfIn PDF document text
    • https://cdn.sqhk.co/zaweniwefi/jjkzku4/nails_of_america_prices_new_caney.pdfIn PDF document text
    • https://cdn.sqhk.co/dewozoju/OijNijJ/eye_color_changer_free_online.pdfIn PDF document text
    • https://cdn.sqhk.co/togixulala/NRVyihb/ielts_academic_writing_sample_paper.pdfIn PDF document text
    • https://cdn.sqhk.co/mofijovelu/jjeCWS4/figoguzuxuxukonowo.pdfIn PDF document text
    • https://cdn.sqhk.co/senaveduwiz/cejbM08/james_brown_i_feel_good_sheet_music.pdfIn PDF document text
    • https://cdn.sqhk.co/tegatiwuwax/ggFGhi7/blue_and_white_robot_cartoon_network.pdfIn PDF document text
    • https://cdn.sqhk.co/sosobita/ibdjgTm/voltage_drop_across_resistor_calculator.pdfIn PDF document text
    • https://puralabeno.weebly.com/uploads/1/3/2/8/132814071/2343dcaa3e2e3a.pdfIn PDF document text
    • https://cdn.sqhk.co/fopujetoros/iyiaFgh/button_with_only_icon_android.pdfIn PDF document text
    • https://tukobigerokigab.weebly.com/uploads/1/3/4/6/134653943/wenavufogot.pdfIn PDF document text
    • https://cdn.sqhk.co/zasokolof/hhjhYXV/photo_eraser_tool_online_free.pdfIn PDF document text
    • https://vogunuwar.weebly.com/uploads/1/3/4/8/134887333/3196686.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/603d09b7-33e1-4b7a-88d3-355bccf129ba/33620154221.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b8c82bd5-91c3-402d-bb8c-8dacb5761a4d/kenmore_110_dryer_repair_manual.pdfIn PDF document text
    • https://28f2c00a-638b-45ec-8848-4d649cb6aba9.filesusr.com/ugd/946f28_32e053e887384e7cac7f3acf22da2e2c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/bcd01d6d-4b1f-45bb-8fbc-fa4b3a32c1cd/tosuwoxanenexobakojoji.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/00170587-72cd-46ea-bc09-6f051741916a/hello_adele_piano_sheet_music_free.pdfIn PDF document text
    • https://5c06e36d-e6a7-492f-989e-88f86e9ca1b1.filesusr.com/ugd/c9ae65_cb535b003ae74a2a872f3252a2a4ad88.pdf?index=trueIn 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
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000100e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100E3 5316 bytes
SHA-256: e28204d557a5f2342a0f3e9c8ca56c1f3a4cbf8b31858aea58a95910527e4fc6
font_01_sfnt_off000112ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112ED 11640 bytes
SHA-256: e089063cb3d8ba1bd7f20c37abea613c4213d48fa2e7d0d6dec73d078833e6af
font_02_sfnt_off000138b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138B7 16060 bytes
SHA-256: 5b0d2701ab39d2f69c66d7d16c60d8db0b323aa0832947137e757b5401d27330