Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b44afe87397992e…

MALICIOUS

PDF

76.8 KB Created: 2021-03-30 13:19:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 11bf83cb902585e1367147156438e8c6 SHA-1: dc2456eaa3637727a5e2fae0efa0d12bae86d4ab SHA-256: 0b44afe87397992ed9e07b1ab2f3f4ad8a96dc1ea9e1c24c89ae36cfa9cc494c
146 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a callback-phone (TOAD) lure. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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.
  • 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://jacksth.ru/aws?utm_term=ninestars+trash+can+lid+dzt-50-9h PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4405413/normal_5ff1c7eb39da0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416494/normal_60563b4ab077d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465386/normal_602fc74442e17.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374839/normal_604564bae7950.pdfIn PDF document text
    • http://bimatixazokepox.22web.org/wixab.pdfIn PDF document text
    • http://pisodaseveporow.22web.org/adobe_after_effects_cs6_tutorials.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443576/normal_5fdaff5d74e54.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454825/normal_605a13240be08.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493209/normal_5fe7666d9c41d.pdfIn PDF document text
    • http://dunetetemob.22web.org/bcbs_of_texas_medicare_advantage_provider_manual.pdfIn PDF document text
    • http://kevesojesofun.22web.org/kebubamerewituvo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/xukanomarexumu/mainframe_jcl_interview_questions_and_answers.pdfIn PDF document text
    • http://nolivajujereram.rf.gd/ielts_vocabulary.pdfIn PDF document text
    • http://didevuxuwodur.rf.gd/57309089499.pdfIn PDF document text
    • https://s3.amazonaws.com/tesotiwapax/automotive_service_checklist.pdfIn PDF document text
    • https://s3.amazonaws.com/tiluwisulepam/cannon_busters_episode_1.pdfIn PDF document text
    • http://laxolivavaru.epizy.com/70194148316.pdfIn PDF document text
    • https://s3.amazonaws.com/tazopaju/dogutolulefesikudidototi.pdfIn PDF document text
    • http://jidufatasakameg.epizy.com/11798652389.pdfIn PDF document text
    • http://karusesaze.epizy.com/aa_step_8_and_9_worksheet.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ebff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBFF 5500 bytes
SHA-256: 1532a16ef5867073e0aee76045516508a936b51026af717ec4a20f325d50801e
font_01_sfnt_off0000febd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEBD 11308 bytes
SHA-256: a8537a3c60f36fe6e0d29553faacabd2ae49a931d5141a5bfecb855c6937dbba

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