Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2e05394a70d86f9…

MALICIOUS

PDF

69.5 KB Created: 2021-02-14 15:36:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 84bb7312e2d7c6afd89af4614712463d SHA-1: 721ebc0fcc3d721d76ea9ebc0969b3434d0365f5 SHA-256: a2e05394a70d86f9c99410532c9ebab1cab88512c3f7e25eca3619ec9125d170
186 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains a significant number of external links, many pointing to disposable hosting, indicating a link farm or SEO manipulation tactic. One embedded URI, 'https://jottigo.ru/123?utm_term=ram+apk+free', suggests a lure related to 'ram apk free'. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of malicious intent, likely to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jottigo.ru/123?utm_term=ram+apk+free PDF link annotation
    • https://gokuxevi.weebly.com/uploads/1/3/4/0/134017514/wujivujege-lubojade-vupos.pdfIn PDF document text
    • https://cdn.sqhk.co/xuxiropuwomo/gclhgZm/most_popular_tiktok_songs_of_all_time.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445321/normal_5fd965d2e394b.pdfIn PDF document text
    • http://lazezubeb.22web.org/naninebagetabo.pdfIn PDF document text
    • https://cdn.sqhk.co/jobezivozuf/fZZvONk/89431118758.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383704/normal_5fe79fcd9da54.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368781/normal_60241bf6e703e.pdfIn PDF document text
    • https://tufelonidozuwux.weebly.com/uploads/1/3/2/6/132681512/2987254.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451225/normal_5fdb89d45e5b0.pdfIn PDF document text
    • https://fuvapevamasazu.weebly.com/uploads/1/3/4/5/134507747/mosidinuxuxuwopanike.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sisuraregimu.rf.gd/chiru_hits_old_songs.pdfIn PDF document text
    • https://s3.amazonaws.com/farezelof/lunebimogosirelale.pdfIn PDF document text
    • https://s3.amazonaws.com/vuzufexarevima/19280199954.pdfIn PDF document text
    • http://popupigewomuri.rf.gd/24530588181.pdfIn PDF document text
    • http://sonowodiguvab.epizy.com/trust_deed_format_for_educational_institution.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_off0000cc22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC22 4908 bytes
SHA-256: 564eabf60a4eda6b252de39964181b0a4357977b505e6b8dc313f6d044855cea
font_01_sfnt_off0000dccd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCCD 14068 bytes
SHA-256: da729ee4c38a1d47a093686226edf41543088429216295b646ec36688abfbeb3

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