Malicious PDF — malware analysis report

Static analysis result for SHA-256 9957c1c49fb3ff06…

MALICIOUS

PDF

70.2 KB Created: 2020-12-23 09:56:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: fbc2a059de6eba836fcf0ef1264a01f1 SHA-1: 1d986cc9db7cc1de24d3d6f9c843467961855a49 SHA-256: 9957c1c49fb3ff06bb126d26883f05ee00fe40c2dd60dc40ad186b51cedb44e7
156 Risk Score

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 to other PDFs, suggesting a link farm for SEO manipulation or to distribute malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external links point towards an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://traffset.ru/aws?utm_term=author+biography+template+pdf PDF link annotation
    • https://ganuwikudafo.weebly.com/uploads/1/3/0/7/130775291/welabubiregevip.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446275/normal_5fb5c3e7450db.pdfIn PDF document text
    • https://wojazaxu.weebly.com/uploads/1/3/4/5/134589930/gawimaw.pdfIn PDF document text
    • https://topemarepebide.weebly.com/uploads/1/3/4/3/134316461/teregu-rularit.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378155/normal_5fdac76758484.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366961/normal_5f8e59c2a5794.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf5a943485235c86bdb055/1606376090470/gumexezosuferera.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbfe7e212facd59cea75dab/t/5fcdc4148a55f2188b97a50e/1607320599484/linaxedu.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc5533cd26ff1194f914669/t/5fc6ab5561e25426e123b105/1606855510888/zombie_hunter_king_mod_apk_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/293886dc-08cd-4b5b-8e93-8baed1dc7161/topic_avoidance_definition.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0eb456b97992eb55c2a22/t/5fc2570a3c02f22b9d58f753/1606571788343/poditapejejinejipowituva.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_off0000d53a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD53A 5508 bytes
SHA-256: db5f773c42dc6cb2e1ccd6e370c65c8b752b25ce51d5b316fd9a35fcee678b6c
font_01_sfnt_off0000e7d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7D9 10648 bytes
SHA-256: d9549f1e19276a1cf1bc8edcdad89f603ccc3a0c7f1578b996758cad28d19a46

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