Malicious PDF — malware analysis report

Static analysis result for SHA-256 98082ed3ec09c3d4…

MALICIOUS

PDF

72.8 KB Created: 2021-02-23 08:35:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: f2b4fb1e21d3ed816191e283cac0fe8f SHA-1: ee47468b0b971c872647012c064943b79fd77e99 SHA-256: 98082ed3ec09c3d40aeea95311ae91933a0ec47d29b21bc78af84b0a2d3b2774
126 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9997

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://seumenha.ru/strik?utm_term=dorian+gray+chapter+1-10+summary PDF link annotation
    • https://jevamupoledi.weebly.com/uploads/1/3/4/7/134712268/pubobex_muwevi_ketosagozokase.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427793/normal_6005584bc62dd.pdfIn PDF document text
    • http://circulshtangcalip.website/monster_hunter_world_events_2020skcln.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477637/normal_602a5969697c5.pdfIn PDF document text
    • https://fokubazukif.weebly.com/uploads/1/3/2/6/132683137/c2e6973f1173922.pdfIn PDF document text
    • https://rajarajo.weebly.com/uploads/1/3/1/3/131398110/panotabufojawarod.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451744/normal_5fd7129922195.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408180/normal_602445b6daa48.pdfIn PDF document text
    • https://palozemoxapido.weebly.com/uploads/1/3/4/3/134366311/xakudax.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446645/normal_6019ffe9b4149.pdfIn PDF document text
    • https://famuvotatag.weebly.com/uploads/1/3/0/8/130813835/golaluzumutevag.pdfIn PDF document text
    • https://zovarufegurer.weebly.com/uploads/1/3/4/6/134625168/8308695.pdfIn PDF document text
    • https://nozoporunetub.weebly.com/uploads/1/3/0/8/130814805/8191707.pdfIn PDF document text
    • https://vesizolakaz.weebly.com/uploads/1/3/4/3/134333528/wufotijuf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000e0fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0FA 5644 bytes
SHA-256: 72930caf6aeac4c9c9f573280bbaa0640da79054aced887e7f82c219c7c198a9
font_01_sfnt_off0000f41e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF41E 10356 bytes
SHA-256: 30905c254b1e26913b806d91379e895a22b9e70625c16b647f6610051adcec48

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