Malicious PDF — malware analysis report

Static analysis result for SHA-256 aee7adfe032c9269…

MALICIOUS

PDF

74.4 KB Created: 2021-01-08 17:56:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: c7190697395acd4301c9494c83a4faae SHA-1: 189d223f48202b9338b41b9fa9c214f1495f5a5d SHA-256: aee7adfe032c9269c5a12084a31a2423d61fccbfe0aa4f509baac4970ba6828d
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous embedded links, with a critical heuristic identifying a "PDF_SEO_LINK_FARM" indicating a large number of external links. One of these links, 'https://trafftec.ru/123?utm_term=task+force+black+book', is flagged as suspicious. The document's metadata suggests it was generated by wkhtmltopdf, and the presence of embedded links points towards a phishing or link-farming attack pattern. No scripts were extracted, but the overall structure suggests an attempt to direct users to malicious content.

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 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.
  • 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://trafftec.ru/123?utm_term=task+force+black+book PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4376600/normal_5f9ef8c11c58b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455659/normal_5fa18e0ee4189.pdfIn PDF document text
    • https://mojenosude.weebly.com/uploads/1/3/1/3/131382274/cb7f3b7698.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368497/normal_5fd6671293a4c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/4bb26633-0ea2-4080-9985-720ffdee5e03/su_tarea_in_english.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dc0c89ef-4624-4cd8-b6f7-3420452b1412/xasijikosal.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dcab72b3-97e7-46d2-829d-baf362a4dcc9/chibi_doll_avatar_creator_online.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/34328495-671b-4692-a1be-d6f5b5dffa4c/kuvikefigefalebulora.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/640c6952-f85a-413b-a381-f20c0c0db049/carnival_dream_cruise_ship_deck_plans.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6cc2e0a1-a0a7-4ff7-9518-55d4fbf5a5ba/3_pandas_in_japan_unblocked_games.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a46c3f96-1867-4956-b35b-a3cc3175f29a/77797306514.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f3fc1bf0-5a36-4fbe-b814-0d0eb23f657f/jakumiwexosotuxunisubiwe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7c6167ea-1865-4eb7-847b-9e5eca402ce2/the_magician_philip_cooper.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/48b480a2-a884-4039-836b-61fc400442eb/loma_test_preparation_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d0778dfa-27c1-4f46-ba6e-69f7ed33d515/xexuruguxawizasobafoj.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_off0000e821.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE821 5028 bytes
SHA-256: ec0a8ccb95debad8aa892f094a101f3f707d8d5c212320308a7d897290d9715d
font_01_sfnt_off0000f94f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF94F 10412 bytes
SHA-256: 8ba93aea3900c085d098247751de85ab0c9f7120f7a0e2aa3865cfc0b4cf40f1

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