Malicious PDF — malware analysis report

Static analysis result for SHA-256 f09a3d1dbb927078…

MALICIOUS

PDF

70.8 KB Created: 2021-02-27 18:09:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 3216ba8b5a9bcf7c74c93fb84dae5c7c SHA-1: 52c21d2e87ea49a99c4cc04dc1dbb4ecdfd59558 SHA-256: f09a3d1dbb9270782fd2ef18b3441c1918d7a58a345ee426eee716664dd58065
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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 0.9997

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://nipisod.ru/123?utm_term=in+ground+basketball+hoop+installation+near+me PDF link annotation
    • http://wisecreditscore.info/mary_poppins_jr_supercalifragilisticexpialidocious_song19p9k.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389084/normal_5ffa585647af4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487399/normal_5fd262ffc58e9.pdfIn PDF document text
    • http://tersq.space/revising_and_editing_practice_3rd_gradef5dc8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4477637/normal_5fedf6b36ae5c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484114/normal_6037c09d9be9b.pdfIn PDF document text
    • http://rat-red.space/the_historians_craftxmzjn.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481515/normal_602214ec3404d.pdfIn PDF document text
    • http://help-lnstagram-verifycopyrgiht.com/gewuvobekabozefivosiitjsc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413012/normal_600bf16342bd4.pdfIn PDF document text
    • http://liketime.fun/what_is_the_chicago_manual_of_style_formathevy5.pdfIn PDF document text
    • https://cdn.sqhk.co/xetokive/IUhhiYN/27702044046.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374704/normal_600ded7330ee3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000d77f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD77F 5512 bytes
SHA-256: 76a699ef9d88760db8b21b83552b0aab7081b920b92b9a21cd7cc28c089c04ee
font_01_sfnt_off0000ea0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA0A 10744 bytes
SHA-256: d132dda6e6555d0dd93ac8b64f269d24ade982c33a0ec0460ce5be1303bfcbb6

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