Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f9cda7ec437ecc0…

MALICIOUS

PDF

70.5 KB Created: 2021-04-06 13:37:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 9464c63103fbd52915a1c02e6d2f39f8 SHA-1: e0e6beccb3cefa1c731e475d920533868356823f SHA-256: 2f9cda7ec437ecc004b85f766c288f64d38b7c0956a13356192cb682e7de5731
126 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan distribution attempt. The document contains numerous embedded URLs, many of which point to link farms on disposable hosting, designed to obscure the ultimate malicious destination. One prominent URL, 'https://jottigo.ru/strik?utm_term=javascript+the+definitive+guide+pdf+free+download', suggests a lure for downloading a technical PDF, which is a common tactic for distributing malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jottigo.ru/strik?utm_term=javascript+the+definitive+guide+pdf+free+download PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4372682/normal_5ff50749db6a1.pdfIn PDF document text
    • http://1fps.ru/vewijugajebilexepimcd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451929/normal_5fe9b02011f16.pdfIn PDF document text
    • https://cdn.sqhk.co/genopeno/2I6jehd/air_controller_salary_canada.pdfIn PDF document text
    • https://cdn.sqhk.co/wolanojijen/hhZOhan/gobata.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421476/normal_5fc64922d6891.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448094/normal_5fd301d575237.pdfIn PDF document text
    • http://nazhivy.net/heal_yourself_101_book7we2p.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488556/normal_5fff976835513.pdfIn PDF document text
    • https://cdn.sqhk.co/suxujaba/AtigjjX/sikozar.pdfIn PDF document text
    • http://dontbeshy.xyz/summary_of_letter_from_a_birmingham_jaild6geu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476590/normal_5ff2bd892bb56.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495988/normal_6024c6117553f.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/c0ab388c-2587-4bf4-b360-524b472c19a3/kojukamixefonajeloza.pdfIn PDF document text
    • https://20128683-61eb-4207-b985-d468b1a81fea.filesusr.com/ugd/0049ca_92d848b314dc448a8265d7221445e05f.pdf?index=trueIn PDF document text
    • https://4c2674ec-1430-4cec-a455-d6a35d10586e.filesusr.com/ugd/38955b_ee28e1d477324a24bab881c0a378037f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a8432dbb-2050-4be8-8158-cc1fa65dd862/leer_comics_tintin_online_gratis.pdfIn PDF document text
    • https://d0fd22f1-78bd-4368-960d-2a324028b2bb.filesusr.com/ugd/a4d998_f4c666e08d3b437191e195ef6448256b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/02e08235-dc8d-4573-8c63-4870a6adc003/stock_requirement_list_for_multiple_materials.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ea3ffc45-2319-47d0-875c-1eb58496d40b/the_redemption_center_bennington_vt.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_off0000d99a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD99A 5560 bytes
SHA-256: 158bae42a2c28c8f715308f690a2ea07c0c0c89c511644a3108633b642b5f448
font_01_sfnt_off0000ec99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC99 9392 bytes
SHA-256: b2fb7ace8c761f86474e452323800475e9300015e1274a81942d1a061c788313

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