Malicious PDF — malware analysis report

Static analysis result for SHA-256 a473c0bdbb8ec831…

MALICIOUS

PDF

95.3 KB Created: 2021-03-30 10:42:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 2b3b18321c43f7b95e10f3a0fad518a9 SHA-1: fc1e314b586b34e604520c6d5bca508a379d87ca SHA-256: a473c0bdbb8ec8314d2bbedb1f0df4ab5a8281c81ab58b3cf86e5f49db69082c
186 Risk Score

Malware Insights

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

This PDF file exhibits characteristics of a link farm, with numerous embedded URLs pointing to external content. The heuristic 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' indicate a large number of links, many on disposable hosting, suggesting an attempt to manipulate search engine results or redirect users to potentially malicious sites. The ClamAV detection and ML classifier further support its malicious classification, likely as a phishing or spam distribution mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://leonvi.ru/wix?keyword=persona+3+fes+tartarus+floor+guide PDF link annotation
    • http://fesagumobelute.iblogger.org/32142556152.pdfIn PDF document text
    • http://xexapitanegis.getenjoyment.net/77026466360.pdfIn PDF document text
    • https://jukuzowak.weebly.com/uploads/1/3/1/3/131379830/8945902.pdfIn PDF document text
    • http://bapuvefiliku.22web.org/25341434355.pdfIn PDF document text
    • https://dezekebewefe.weebly.com/uploads/1/3/4/7/134731304/1393417.pdfIn PDF document text
    • https://kaxozugusejerob.weebly.com/uploads/1/3/1/4/131452826/tejizivunaf_getikufulezolim_davobineron.pdfIn PDF document text
    • https://lagonola.weebly.com/uploads/1/3/4/8/134851586/3b98f58432c.pdfIn PDF document text
    • https://lokaxanexu.weebly.com/uploads/1/3/4/6/134638146/9154139.pdfIn PDF document text
    • https://jifafaxima.weebly.com/uploads/1/3/1/8/131871415/bf49b529ecb18f0.pdfIn PDF document text
    • https://venubitolaxi.weebly.com/uploads/1/3/4/3/134372432/4908052.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://f84ffea9-2755-49c2-9cb5-47ca8b55fe65.filesusr.com/ugd/0adedf_e998e14b55ba46e7ac9dbf7070bb78d1.pdf?index=trueIn PDF document text
    • http://judejelalub.rf.gd/corsair_k95_rgb_platinum_xt_mechanical_gaming_keyboard_review.pdfIn PDF document text
    • https://50b7e5d6-ab0e-41ff-bbcb-47d024e5c277.filesusr.com/ugd/45d8ab_663c39c75f184d6c903d36eaaa021ea0.pdf?index=trueIn PDF document text
    • http://gasonuranokojof.epizy.com/reset_bushnell_neo_ghost.pdfIn PDF document text
    • https://502f924d-676a-41b3-8220-87c01882f600.filesusr.com/ugd/5a20bb_0fccbe1973fb42bea6cf5b5bdc4420ee.pdf?index=trueIn PDF document text
    • http://nifibomagogov.rf.gd/vocaloid_hatsune_miku_free.pdfIn PDF document text
    • https://3c2b787d-8465-4662-bdcc-bf736d584291.filesusr.com/ugd/8760e7_281d839aba3549d4adc170d7e137317d.pdf?index=trueIn PDF document text
    • http://nojikigor.myartsonline.com/en_un_metro_cubico_cuantos_milimetros_cubicos_hay.pdfIn PDF document text
    • http://situwosase.myartsonline.com/anchorman_2_script.pdfIn PDF document text
    • http://terunakef.rf.gd/emoji_stickers_for_messenger_apk.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
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000124b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124B9 3612 bytes
SHA-256: 60258dd3a4cc2c053c5161983a948669e8d1c00d8384b861fda6bed481118d5e
font_01_sfnt_off000131a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131A6 5240 bytes
SHA-256: 927f17dd4f29ba0f2cee84aa765ac7a54c1921f8a266a334d791d035130403f3
font_02_sfnt_off00014382.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14382 13056 bytes
SHA-256: e00df2c1d76eaa11f1931691148cb7e51e1d1f7b1180611bc7368530dd84a943