Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a3a4ed4ac3b8bd1…

MALICIOUS

PDF

81.3 KB Created: 2021-03-20 08:49:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 98411c330ea89a29a9193659cf190221 SHA-1: 1285145dcda18eb13f836f3787a96751fdb7e13a SHA-256: 9a3a4ed4ac3b8bd1c0adb808c662ef2ad2088490f4897a2da37d2a54f45f4904
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high probability of malicious intent. The document functions as a link farm, containing numerous external links to other PDF files, likely to manipulate search engine rankings or distribute further malicious content. The primary URL observed is associated with a keyword search, suggesting a phishing or SEO manipulation tactic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://druttle.ru/award?keyword=active+directory+basics+interview+questions+and+answers+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4490265/normal_5ff488fa703af.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4505358/normal_601a06a5b12c8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488815/normal_6047f305597ec.pdfIn PDF document text
    • http://mivimivisodawo.iblogger.org/peketegibal.pdfIn PDF document text
    • http://visumetanopigi.iblogger.org/harley_softail_service_schedule.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408323/normal_6000451e94766.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408997/normal_6016c6e92f693.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://79d8ee67-2172-45f8-9737-086b37aa5bdf.filesusr.com/ugd/2ab2ae_ecff2e2d489645c9ae90726072de95f2.pdf?index=trueIn PDF document text
    • https://6eed613e-cbae-405e-b458-9655ef9033f8.filesusr.com/ugd/e4f6f0_0d941525b0b44bd9a6c9ada7bc6a95af.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nuvukivaxiren/descendentes_3_filme_completo_utorrent.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a58afd8d-0bf7-4d8f-ac73-645bcda509e5/webuku.pdfIn PDF document text
    • https://e691ad07-92dc-45fa-af10-8929b4045ede.filesusr.com/ugd/87b9a8_240b9def96d5470893018c3b0fd9a359.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vutame/xokakexiwesakonis.pdfIn PDF document text
    • https://18cceff7-6d50-42ec-9d85-67184b61345e.filesusr.com/ugd/8c2e83_6d69dd3cc7e7473894ebd04e5c6962f0.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a944d321-b78d-48be-ae77-cb27d88f5625/muxekofonol.pdfIn PDF document text
    • https://s3.amazonaws.com/patilawasu/43702501108.pdfIn PDF document text
    • https://921790ca-7b53-43bd-a25d-275d6f056404.filesusr.com/ugd/9d24cb_d93a9b2bdcf44b9cb95f74c40c3b18e8.pdf?index=trueIn PDF document text
    • https://46c19374-600d-43be-a5f2-d8bf07c6fddf.filesusr.com/ugd/cc94a4_07d67de7ec374cfe83dcff7e5b1ea10e.pdf?index=trueIn PDF document text
    • https://5071cc05-3fa2-46b1-b944-d2523ca4b51d.filesusr.com/ugd/62e2c1_2008e59e984446e79b4fed935f407acf.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3d4fb98c-b124-44b9-95e7-9cc4facfa233/gaponalejep.pdfIn PDF document text
    • https://77bc4ea4-de20-41c0-a463-a5315db628d9.filesusr.com/ugd/2c69e3_c3f68f3c9c54447fbe94c8efa86634e1.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gosete/xevaxobemaza.pdfIn PDF document text
    • https://s3.amazonaws.com/pazovugal/the_impossible_quiz_2_answers_31.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_off00010171.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10171 5628 bytes
SHA-256: 363bedd3aacdff6911ff3ce1ea7fe9e4ffbd256fb50565706ec60db2f05cd374
font_01_sfnt_off000114be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114BE 10592 bytes
SHA-256: 44039b215873902029f1ce809c74ad8f7bf1f888e80e512c05a29c8ff5f63894