Malicious PDF — malware analysis report

Static analysis result for SHA-256 c86bae63bb16ae42…

MALICIOUS

PDF

73.9 KB Created: 2021-02-28 14:08:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f5c3b83b6fd240f99288cec07d1f8bc0 SHA-1: 54c58e34832c69331a15e746e2f5cc7fadcf1f04 SHA-256: c86bae63bb16ae42e3fc765624392436a999ced9569fedbad95946b6a0f04f4b
176 Risk Score

Malware Insights

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

The file is a PDF that contains numerous external links, many of which point to other PDF files, suggesting a link farm or SEO manipulation tactic. The document body, though heavily obfuscated, contains text related to "www hotmail com br email entrar", indicating a potential phishing lure. The presence of ML and ClamAV detections further supports its malicious nature, likely as a phishing document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://druttle.ru/wix?keyword=www+hotmail+com+br+email+entrar
    • http://gilumesu.mypressonline.com/welokefidixinageka.pdf
    • https://cdn.sqhk.co/musutalivun/uVuWyid/fomive.pdf
    • http://infonewsuk.site/korean_dictionary_with_english_translation_fileqq7vh.pdf
    • https://cdn-cms.f-static.net/uploads/4464524/normal_600dfae7ee109.pdf
    • https://static.s123-cdn-static.com/uploads/4386594/normal_600955a313744.pdf
    • https://cdn-cms.f-static.net/uploads/4414176/normal_601bc6c0c3c38.pdf
    • https://cdn.sqhk.co/jizesusaxeta/aibgfib/face_mask_sign_in_spanish.pdf
    • https://cdn.sqhk.co/kawonidoza/ibgcmvg/34107459936.pdf
    • http://fawikenaxalu.scienceontheweb.net/how_do_you_reset_a_keurig_after_descaling.pdf
    • https://cdn.sqhk.co/fabetojowuje/c6QtjjK/unsecured_small_business_startup_loans_bad_credit.pdf
    • http://ductsunlimitedins.com/how_to_put_on_a_book_jacket_coverwuy0l.pdf
    • https://cdn.sqhk.co/kebubupoxiz/n6jjx0S/nuzanegitegokexomid.pdf
    • http://lunatan.medianewsonline.com/depodibefosegararikuto.pdf
    • https://wofovado.weebly.com/uploads/1/3/1/8/131871653/gekejutox.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://bomatep.rf.gd/cost_structure_garment_industry.pdf
    • http://joxegav.rf.gd/how_to_pass_forklift_training.pdf
    • http://kamiwivexa.epizy.com/a_court_of_thorns_and_roses_spoiler_free_review.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e482.bin
004dc7a51191c53f4cfd099f045fdd03a16696435e1063aa76f345370f08c86c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE482 5108 bytes
font_01_sfnt_off0000f5c7.bin
5ee9a68d71596408e656410acb09f8d9b300ed7ab5d20f27c8ed408c3b00c1ec		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF5C7 10912 bytes

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