Malicious PDF — malware analysis report

Static analysis result for SHA-256 af5d17b4647e6e1c…

MALICIOUS

PDF

76.1 KB Created: 2021-09-11 03:26:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4ebdf56ece6820f3d607979c83a65411 SHA-1: 8c6b1e89747064da7cc4d272920f495d1efc91da SHA-256: af5d17b4647e6e1c40787b015d93bda03f6c51517f2b6b1633b12f6b56f50d4c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to other PDF files hosted on various domains, indicating a link farm designed to obscure the ultimate destination. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this is a malicious tactic. ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious classification. While no scripts were explicitly extracted, the structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://xn--h1agcmh.com/ckfinder/userfiles/files/73976114951.pdf
    • http://tunesistudio.eu/userfiles/files/81807826157.pdf
    • http://technimexvn.com/images/ckeditor/files/bemob.pdf
    • https://propiedades.net/ckfinder/userfiles/files/14647627879.pdf
    • http://poorclarescork.ie/images/rebazebadajuxejevoxabibu.pdf
    • http://baocaosuhoatoc.com/luutru/files/46191584361.pdf
    • http://www.tecs4.com/intranet/ckfinder/userfiles/files/69947199979.pdf
    • https://loffoxfitness.mvwebsolution.com/userfiles/files/rozuxor.pdf
    • http://gamax-moto.cz/data/dokumenty/wogadetudawumibiteku.pdf
    • http://www.jasolasia.com/image/upload/File/96622610485.pdf
    • http://ganteltechnology.com/system/userfiles/file/19327872943.pdf
    • https://e-motorcycle.tw/upload/emotorcycle/files/jirimonoso.pdf
    • http://concilianavarra.com/userfiles/files/zovupelido.pdf
    • http://eko-baby.ru/userfiles/file/36659484737.pdf
    • http://lica-mpt.it/userfiles/files/xokovoxitire.pdf
    • http://patroha.hu/file/90374598501.pdf
    • http://colafranceschi.it/userfiles/files/85578272702.pdf
    • http://vibrobeton.by/pics/files/zevamaserusimujutixokip.pdf
    • https://sogelec-eng.com/files/ckfinder/files/fosaxatinusu.pdf
    • http://ladispensadicampagna.it/uploads/assets/file/dasosuvokexijanovilusub.pdf
    • http://jingluo.net/uploadfiles/files/gekemigugadabelebojonuxij.pdf
    • http://okna-kurska.ru/page_edit/_samples/userfiles/files/dotijupumisalipaj.pdf
    • http://architettobotteonpierpaolostudioabacus.it/userfiles/files/43191702891.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=granny+1.1+apk
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c3da.bin
28b05ac298db91c809ac3ef46019a41c3c5946d88cdff7b878f70a7b6edb9b60		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC3DA 9952 bytes
font_01_sfnt_off0000d9fe.bin
159e25d3357d2093ac3c1733b7537b134ea30fd0909eede883f29b1704d9d507		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD9FE 18880 bytes
font_02_sfnt_off00010b12.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10B12 16792 bytes

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