Malicious PDF — malware analysis report

Static analysis result for SHA-256 083a026431f44c52…

MALICIOUS

PDF

82.0 KB Created: 2021-09-11 08:22:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 82c9869a83dd12b8ee0fc89321ac367c SHA-1: 5115aa402a92870886e40053945fca91536623d1 SHA-256: 083a026431f44c52887e0c6270edcb866a9c5790fcdc37c9dd1654257841d4a1
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the extensive use of external links suggests a redirection chain to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://stnicholasway.com/userfiles/file/96891804188.pdf
    • http://szm.hu/userfiles/file/fididigagafezatubelivu.pdf
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/1151644fcd8408b123055bbf79bd8af4/69955111976.pdf
    • https://okazionche.com/files/53475899619.pdf
    • http://desiaussies.com/ckeditor/uploads/files/jolakabemejinenigote.pdf
    • http://matras-devison.com/upload/file/74219452786.pdf
    • http://debrecen.varosom.hu/userfiles/files/86025002703.pdf
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/161393a5865e65---dakosarewejulamudabujaret.pdf
    • http://mtsskzy.com/userfiles/file/74910379381.pdf
    • http://youandisagenix.com/ckfinder/userfiles/files/41961340594.pdf
    • http://robvancampen.nl/userfiles/file/78803031763.pdf
    • https://weeb.nu/userfiles/file/76871836507.pdf
    • https://orcasproje.com/userfiles/file/kulibe.pdf
    • http://cameralehiep.com/hinhanh_fckeditor/file/tubenazavakupasipipaseluv.pdf
    • http://co-wemart.com/careeruserfiles/file/xowomopodidajagenejovizal.pdf
    • http://milwaukee.center/userfiles/file/90213929301.pdf
    • https://mallarpurnaisuva.org/go/file/50849474424.pdf
    • https://salonrewards.ca/images/file/38252409373.pdf
    • http://dlastudenta.org/Upload/file/57069128144.pdf
    • http://greenld.com/userfiles/33585490369.pdf
    • https://paklya.su/design/img/upload/file/19125305154.pdf
    • http://sun-green.nl/ckfinder/userfiles/files/kazuzaximiveteripekujilad.pdf
    • https://sunwayhk.com/louis/STARKGROUP/ckfinder/userfiles/files/37054247677.pdf
    • http://riskhedgetech.com/uploaded/file/22539428661389b1ecc251.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=remembering+the+kanji+pdf+vol+2
    • 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_off0000d56c.bin
c80f8b0b2f502670fd7378964856e7274209cf03c5a104c9d027f9b33c404e43		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD56C 19432 bytes
font_01_sfnt_off0001082d.bin
0179e305bc6430522517be6eacae57adcbc328e6dd60b14bc2b91f90fcdcd196		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1082D 11372 bytes
font_02_sfnt_off00012256.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12256 16792 bytes

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