Malicious PDF — malware analysis report

Static analysis result for SHA-256 183cd369c1c3b575…

MALICIOUS

PDF

76.0 KB Created: 2021-03-15 01:11:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 8ce097a29b571b9c0da17e8a58ce6239 SHA-1: 17f26f3d9553d85f6362d910f9c852b007bf5fc7 SHA-256: 183cd369c1c3b575ac8830512bbd50b86b73fcb41560711c7e235e5c2370bd91
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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 0.9998

Heuristics 6

  • 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.
  • 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://baarspo.ru/123?utm_term=ncert+books+for+class+7+science+answers PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4489054/normal_5ff9aaac425e0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426415/normal_60384d7b5f172.pdfIn PDF document text
    • http://xovuwowim.mypressonline.com/functional_food_journal.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446161/normal_60088a4fe8015.pdfIn PDF document text
    • http://gesetaxoxu.sportsontheweb.net/types_of_interview_techniques.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454971/normal_6046ca5e47603.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384652/normal_60414a1e8bb6e.pdfIn PDF document text
    • http://bapulesaj.mygamesonline.org/anthropology_optional_paper.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://d8d078ea-10ec-4787-8e21-ef6e32b87a24.filesusr.com/ugd/8f6098_1446da3b9d424e8b9596caebe708c8ef.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jojitagifuva/12805625061.pdfIn PDF document text
    • https://3dbd840c-7861-42b4-b064-af52d1d2f4eb.filesusr.com/ugd/86319b_aa0bda13c9934031a7e586608d31e50d.pdf?index=trueIn PDF document text
    • https://ddc7b23b-31e5-4b5c-aaad-d3b7cef26861.filesusr.com/ugd/e506b8_77717dc5bd4b423581902b635b9efad6.pdf?index=trueIn PDF document text
    • https://27158da8-170d-48ca-a528-b8ced62fe517.filesusr.com/ugd/9fc8c3_7db8bb23e5e3455ea2235c13c34bc62c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vufuzewasi/55355048419.pdfIn PDF document text
    • http://liroporuki.myartsonline.com/fz_bike_new_model_2017_mileage.pdfIn PDF document text
    • https://3c3b6f52-20a2-448a-be11-eec5930c502f.filesusr.com/ugd/0ca786_60ef69d455fc4669b465eba4710bfc90.pdf?index=trueIn PDF document text
    • https://67a4337f-2b79-4d04-9c1d-2578c80f4945.filesusr.com/ugd/964009_c456b1b56ab841e2844aa869367b792c.pdf?index=trueIn PDF document text
    • https://a179b4bb-f9e1-4b0b-8685-f881d2afde68.filesusr.com/ugd/0fdb6d_f18255c81e9b4117ac5dd8351e231827.pdf?index=trueIn 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_off0000ec88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC88 5220 bytes
SHA-256: 988b2c46e8c0d8e404a2324e0707a7d9aab00249b938c176ad2fdc8e42ba28ac
font_01_sfnt_off0000fe7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE7F 10728 bytes
SHA-256: ddf049d84e19c91fd614906dfacbbeefdaf12acf2660cf2f2ff25aced7130c1b

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