Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fed4b1ad94a3995…

MALICIOUS

PDF

77.6 KB Created: 2021-04-07 02:00:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 5740abe12cddefda0ec170e56ec91b2e SHA-1: 105a12d91e0af9dcc669e57ee4722fa9592c1342 SHA-256: 8fed4b1ad94a399541e276e975e10bc58753b2d965d4a22a6abb9af43475ac21
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of external links, identified by the PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics. The ML classifier and ClamAV detection strongly indicate maliciousness. The primary purpose appears to be directing users to a network of linked PDFs, likely for SEO spam or to serve as a distribution point for further malware, rather than delivering a direct exploit within this PDF.

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://maypoin.ru/award?keyword=cimetidina+mecanismo+de+accion+pdf PDF link annotation
    • https://bobovisosusare.weebly.com/uploads/1/3/5/3/135394734/16bf14210.pdfIn PDF document text
    • http://gitilapen.66ghz.com/29_card_game_free_for_mobile.pdfIn PDF document text
    • https://badazunezibak.weebly.com/uploads/1/3/5/3/135338398/zelelozibejavaxapa.pdfIn PDF document text
    • https://zikepasut.weebly.com/uploads/1/3/4/1/134108801/6375817.pdfIn PDF document text
    • https://cdn.sqhk.co/nuroteditu/dcih2hj/69339143656.pdfIn PDF document text
    • https://cdn.sqhk.co/puxobaku/dArcUia/simple_cute_dogs_to_draw.pdfIn PDF document text
    • https://cdn.sqhk.co/kufagilan/IgjiaHA/87385338135.pdfIn PDF document text
    • https://cdn.sqhk.co/dugixikisim/fhhmbia/viral_news_urdu_breaking_news.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://7f793f8f-877f-420e-851b-8bae9ea62a4d.filesusr.com/ugd/78c764_a0be744170114bb3bf9982b735974fa4.pdf?index=trueIn PDF document text
    • http://goguvero.epizy.com/24178486751.pdfIn PDF document text
    • https://8b83d164-5e56-46cc-b941-48f48810ddf3.filesusr.com/ugd/76ce43_1fb6e2ffd79c4944a6b2a15d313bb945.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gurupixabogivaz/xibafiximiketoxeminajigox.pdfIn PDF document text
    • https://16e729f2-8c5c-4787-b670-14aeba6c5e03.filesusr.com/ugd/ac55e2_8563e217f1634e6fa9f08cd0040c9c2b.pdf?index=trueIn PDF document text
    • https://70fbc5f3-53e4-4072-9ff7-a5862d19847b.filesusr.com/ugd/bb3bf9_b7e5ee2f62a14c668ff62f3b267c0c3d.pdf?index=trueIn PDF document text
    • https://6c8027e1-9878-41b3-a9ef-32ba2b6bcd02.filesusr.com/ugd/185811_0b67022596bc4fba90479c1243f2385c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vinivuxo/bangla_shayari_video_free.pdfIn PDF document text
    • https://144c9d4d-401b-437b-b89f-6a5816d7da47.filesusr.com/ugd/cd33f5_63b459bd9c024b52a33aa4d6bdabea65.pdf?index=trueIn PDF document text
    • https://45ae50e1-98a8-4501-9ad6-fc0df438eb43.filesusr.com/ugd/b16523_a99fd9e410c646dea7d2ca11e287fb2a.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_off0000f228.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF228 5080 bytes
SHA-256: 8723bb8fd524d0c92261b224480b44a232ff58d03ecc3c3e32273ff451d79a57
font_01_sfnt_off0001035a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1035A 11008 bytes
SHA-256: 4669a6445eb392660d1e22ba97706a6f447b6cd6e2babd44536d7921b2038822

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