Malicious PDF — malware analysis report

Static analysis result for SHA-256 89b9777a8c5c2fa3…

MALICIOUS

PDF

75.3 KB Created: 2021-04-02 01:12:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: fc34842750889336c5ae71eed54c0e1b SHA-1: 764f276d4f62404881eb5222dae0be9c60901aac SHA-256: 89b9777a8c5c2fa3b58ed31736915893ecb5454ba34296620c0e7ec36c42932c
186 Risk Score

Malware Insights

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

This PDF file is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to numerous external PDF files, many hosted on disposable domains. The document body, though partially garbled, suggests a lure related to downloading books, likely a pretext for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://ponafet.ru/award?keyword=english+dictionary+book+download+pdf PDF link annotation
    • https://noserosajegupa.weebly.com/uploads/1/3/1/4/131453720/nuvomofufojo.pdfIn PDF document text
    • http://leree4.club/brinkmann_smoke_n_grill_gratesy4n31.pdfIn PDF document text
    • http://apsdd54gfv.xyz/nuseruzilaxiwunewanimejejww9z7.pdfIn PDF document text
    • http://kelnoteres.xyz/kuwofut77iv.pdfIn PDF document text
    • https://cdn.sqhk.co/pijajawopoji/gsih3ib/63316613096.pdfIn PDF document text
    • https://narepugajud.weebly.com/uploads/1/3/0/7/130775299/7885541.pdfIn PDF document text
    • https://cdn.sqhk.co/zadoweferoxe/hiPdz0m/pelidejijobuposidanujud.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://94db4134-5784-44c5-a63d-963e509970fa.filesusr.com/ugd/9c58c5_528a1e296f8d48fa895da08105ace1e3.pdf?index=trueIn PDF document text
    • https://7095e710-59ac-4d27-8a5a-f3bbcaf65deb.filesusr.com/ugd/418e76_cfcffd7a9cc14dcaa6956876450308a0.pdf?index=trueIn PDF document text
    • https://b3a1a1c9-4f8f-4fb8-b7cc-7339030cc889.filesusr.com/ugd/162fe6_f859534a3ee249a8a7866eba4734a388.pdf?index=trueIn PDF document text
    • https://7fd672c9-0ac8-42d3-9d3c-9ebb2fbea2b4.filesusr.com/ugd/92785a_78115055c0a74150aff61cf46266717c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/mokamoba/kangaroo_math_practice_tests_pakistan.pdfIn PDF document text
    • https://be1d055c-b83b-422e-9e68-1bf13cef350c.filesusr.com/ugd/5b1e3c_8d79e94173e14850a9232e49ecff5ea7.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nakevoja/57088187356.pdfIn PDF document text
    • https://s3.amazonaws.com/bexolamabad/panevu.pdfIn PDF document text
    • https://ff9dba89-6132-4485-99c2-ace8a2453124.filesusr.com/ugd/c3f59f_29dab8d808184c158924b1a112b05821.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_off0000e725.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE725 5772 bytes
SHA-256: 03a7942aa5cec52b50f591b4e3ac11a8a3da9e3c62144637c1f25bfa5261492c
font_01_sfnt_off0000fae9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAE9 11012 bytes
SHA-256: d88fd3bea48d109258330c7dd9a38bfd6d2b76a7e9cc588136c11b397c745106

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