Malicious PDF — malware analysis report

Static analysis result for SHA-256 afe4efdc6d2462e4…

MALICIOUS

PDF

79.7 KB Created: 2021-03-16 10:30:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: cdb2ed6a4590a5ff76af7d86ca262f64 SHA-1: 2083cf54824487bdc6dd904674567ed3fc25927f SHA-256: afe4efdc6d2462e4652d6febb91cea9f8e5e843fb80ed38eda3731104c36d7c7
186 Risk Score

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-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://xajibur.ru/award?keyword=partitura+bohemian+rhapsody+para+guitarra+pdf PDF link annotation
    • http://domapekoti.22web.org/91038235574.pdfIn PDF document text
    • http://mebel-albero.ru/my_growing_baby_alive8pn11.pdfIn PDF document text
    • http://odemebayisitrafik.com/puxakaladakogumilimitoz4s8sc.pdfIn PDF document text
    • http://fitness1.space/gewutofevinopugaketikys36.pdfIn PDF document text
    • http://idealsit.space/dear_comrade_movie_in_tamilmvzhnhr.pdfIn PDF document text
    • http://businesshelpservice.com/are_garage_remotes_universalt2odc.pdfIn PDF document text
    • http://atlas-copco.su/furulisizugejaxani7nihz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://ea64ff4c-51e6-4efc-8cc1-399682447901.filesusr.com/ugd/961f18_16d3f373ac6b4e7d9a4579f4dc584754.pdf?index=trueIn PDF document text
    • https://7133fc40-0b9c-4701-b953-e7fafc934b44.filesusr.com/ugd/70a38d_32a784b47ef542e9ac7ef77889a1457b.pdf?index=trueIn PDF document text
    • https://50b44c92-959e-4a15-bf83-93d6b2b518d6.filesusr.com/ugd/3ed44c_3233163a289d4e3b95236b82854002ff.pdf?index=trueIn PDF document text
    • https://1a2149e7-ca7f-4e7c-a584-0e483de6f3af.filesusr.com/ugd/9219f8_594ed766a7574b689995e3555aa46cb6.pdf?index=trueIn PDF document text
    • https://72cee60b-533f-4fda-9f40-87b1bb6f0553.filesusr.com/ugd/590778_40fe92c0b6874c9caec3c83df636318c.pdf?index=trueIn PDF document text
    • https://02ee9779-94d6-4ec7-959f-c0f99fe19a35.filesusr.com/ugd/cdc607_1f5855bf802645e3963e500da7b1e0c6.pdf?index=trueIn PDF document text
    • https://0bef8565-087b-457a-960c-b0529baba50c.filesusr.com/ugd/638000_5e54a02b525a4f36893800ebe1ad1902.pdf?index=trueIn PDF document text
    • http://vikomalagojuv.epizy.com/odia_dj_song_video_mp4.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_off0000f74e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF74E 5664 bytes
SHA-256: 766adb1fddd57ac91648ca13e02c04ec3a1f7242dacfa4b8f39d40c735b72f4e
font_01_sfnt_off00010a72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A72 11004 bytes
SHA-256: d1a7354522fd7b854471506e9d350f43dab9682da6a160143b5f8a97d5f2c6e3

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