Malicious PDF — malware analysis report

Static analysis result for SHA-256 05aa6f2b67834292…

MALICIOUS

PDF

69.2 KB Created: 2021-02-28 11:58:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 577d9127178e5914f8d6907927d21412 SHA-1: 00adbf16faed5859ace7de8969f9bea936705ce3 SHA-256: 05aa6f2b6783429229efd846fff5630c25659bf694db1f3bda5f0b49debeffe5
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, many of which are hosted on disposable domains, suggesting a link farm designed to distribute malicious content or phish users. The presence of a link with a 'utm_term' parameter matching a common search query indicates a lure to attract unsuspecting users. The ML classifier and ClamAV detection strongly indicate malicious intent.

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 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://ponafet.ru/123?utm_term=how+do+i+reset+my+ge+stackable+washer PDF link annotation
    • https://tekigeja.weebly.com/uploads/1/3/1/3/131384442/zijakunimagi.pdfIn PDF document text
    • https://gaxiworet.weebly.com/uploads/1/3/1/4/131408942/pugabujanok-subopuxexaxuwu-zibixaretamel-patajo.pdfIn PDF document text
    • http://vir-tus.com/financial_accounting_for_mbas_7th_edition_answer_keyg0gkj.pdfIn PDF document text
    • https://cdn.sqhk.co/kelufuro/f2lUjgZ/star_wars_galaxy_of_heroes_cheats.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489977/normal_6009778d208ff.pdfIn PDF document text
    • https://cdn.sqhk.co/dapumexader/ghfhhgg/top_trending_twitter_hashtags_world_today.pdfIn PDF document text
    • https://cdn.sqhk.co/mozigizax/qhvihjb/nintendo_switch_online_family_membership_code.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4498992/normal_601b1aa02059a.pdfIn PDF document text
    • https://cdn.sqhk.co/moromasi/jeUC5RZ/jerupepejudax.pdfIn PDF document text
    • https://pedasivu.weebly.com/uploads/1/3/5/3/135387907/jitujalawe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://joriboka.epizy.com/clustertruck_free_2018.pdfIn PDF document text
    • http://fadowudi.rf.gd/jedezufezorixenit.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_off0000d315.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD315 5712 bytes
SHA-256: a2808c5b1fb1d5443f2d72dfa45792009e7c89220687e8e75aa0992295ffc613
font_01_sfnt_off0000e66c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE66C 9904 bytes
SHA-256: 1897dc0ded73cc720f25b3f270e00d7a5169ec8d4a3659bd367c21df5e379d86

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