Malicious PDF — malware analysis report

Static analysis result for SHA-256 deaccbb03e4b70b2…

MALICIOUS

PDF

77.0 KB Created: 2021-03-17 23:28:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 77457c869d312ea1fffe1d4680cb1629 SHA-1: 9f6098e060e378886ccc53c1eb5de7e439970b9d SHA-256: deaccbb03e4b70b2e40204fce0bc2730fdeca7761ae9e4d5db65f9c6aa4a5798
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. 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 5

  • 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.
  • 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://zajinet.ru/123?utm_term=bulk+density+of+sand+pdf PDF link annotation
    • https://cdn.sqhk.co/vuvapolaxaj/mKgjnam/lodosenunuzafajoxoz.pdfIn PDF document text
    • http://bulubuzigajuzar.getenjoyment.net/30968772640.pdfIn PDF document text
    • https://cdn.sqhk.co/mumeriretepi/dBhARig/wejanufelonukepesadol.pdfIn PDF document text
    • https://cdn.sqhk.co/tofatuxurejo/gdjebii/64549798493.pdfIn PDF document text
    • http://povulofi.mywebcommunity.org/alkanes_iit_jee_notes.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://ketawod.epizy.com/40051670610.pdfIn PDF document text
    • http://wotidupodugi.myartsonline.com/xufowujadinutalos.pdfIn PDF document text
    • http://wejivuwipo.epizy.com/63962496608.pdfIn PDF document text
    • https://s3.amazonaws.com/dazuxujepov/representative_payee_accounting_report_online.pdfIn PDF document text
    • http://zaxutakizet.epizy.com/rafikoritobasifijapide.pdfIn PDF document text
    • http://povaxuvibilab.epizy.com/vesuguvejitafukixetix.pdfIn PDF document text
    • http://tikolikenugim.epizy.com/zenadoduvejam.pdfIn PDF document text
    • http://xaxefoz.epizy.com/kudilapamakirumiw.pdfIn PDF document text
    • http://dotedofapi.rf.gd/samsung_washer_model_wf210anw_xaa_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/jakujakula/pronouns_quiz_grade_4.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_off0000efbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFBE 5156 bytes
SHA-256: 8d021873c8be33013e4ecc877cc52f12abaa57506feb59eec69889cf6fa1150c
font_01_sfnt_off00010171.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10171 11152 bytes
SHA-256: 1462c6968c3e4d3074f517c0c21fe35cb292e59b0e2ac313945fd65bbb256c08

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