Malicious PDF — malware analysis report

Static analysis result for SHA-256 914a7aea2ce81ff9…

MALICIOUS

PDF

71.7 KB Created: 2021-02-28 23:36:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: b7816f25351b3d8698ba612ef0e70561 SHA-1: 26068bbb2c2993efcc527c237de490b8d046199f SHA-256: 914a7aea2ce81ff9339544d349f7eb426d4e21ef5e9e74a1a6caa8311eb5dfa1
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous external URLs, with a significant number pointing to disposable hosting and forming a link farm, suggesting a phishing or redirection scheme. The document body's obfuscated nature and the presence of external links strongly indicate an attempt to direct the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://ponafet.ru/123?utm_term=cat+in+the+hat+original+book+cover PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4483075/normal_5fd0949cb16bd.pdfIn PDF document text
    • http://dogazalalun.22web.org/30021951015.pdfIn PDF document text
    • http://mozodulo.iblogger.org/redis_for_windows.pdfIn PDF document text
    • http://xorabawik.medianewsonline.com/jasotaporananu.pdfIn PDF document text
    • http://mobeditobaxul.scienceontheweb.net/what_are_the_different_roles_in_scrum_process.pdfIn PDF document text
    • http://pijabaralipori.22web.org/febukigo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381541/normal_5fe725db892f3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467950/normal_5fe18c03ce652.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414849/normal_5fe36294078f4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501503/normal_5ffd49a34c8d4.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/ronatiduzoxij/gomomesetivu.pdfIn PDF document text
    • https://s3.amazonaws.com/wizuluworafid/28212721504.pdfIn PDF document text
    • http://kuwalenidil.epizy.com/80414271538.pdfIn PDF document text
    • http://bozusofofutuv.rf.gd/2006_dodge_ram_1500_service_manual.pdfIn PDF document text
    • http://fuvituze.epizy.com/wijijolojavo.pdfIn PDF document text
    • http://wotidupodugi.myartsonline.com/coleman_powermate_pro_gen_5000_manual.pdfIn PDF document text
    • http://kumexitogo.epizy.com/sas_ods_graphics_syntax.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_off0000dc4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC4A 5052 bytes
SHA-256: b0831b42b27198a8aa2b3597cf53466f625f9d208dca14d2adfcc7f175f8c611
font_01_sfnt_off0000ed7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED7B 10640 bytes
SHA-256: 1cdfa3b75676ce25ecd243ea58d711fb6f7b56b8dd2c9c226842886ee65b531c

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