Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e66434f416708cc…

MALICIOUS

PDF

83.7 KB Created: 2021-09-12 15:43:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 844737b3cd4f03e2ef525d9d047bcbf6 SHA-1: 303263a28abbbcfade65815a24794216599293f5 SHA-256: 7e66434f416708cc3d80d3342d3834f7aa139580c52ff6e30f597bcf8c0335ef
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document contains numerous links to potentially disposable domains, a common tactic for phishing or malware distribution. While no scripts were extracted, the presence of many embedded URLs points towards an attempt to redirect the user to external, potentially harmful, sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 5

  • 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 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://fedico.ca/upload/editor/file/90346377663.pdf
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/16135c8ba37722---vomatagosej.pdf
    • http://zh-huaxun.com/uploadfiles/files/zepadum.pdf
    • http://hoadondientu-ptp.vn/images/ckeditor/files/60073004642.pdf
    • https://shoppingplanet.ro/ckfinder/userfiles/files/2034062531.pdf
    • http://hmconcretemixingplant.ru/d/files/44161356855.pdf
    • https://mimpishio.com/contents/files/94642710539.pdf
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/27392a78658b551e4f8dbbbc92ad9c10/xerikeputunotadekebemipe.pdf
    • http://steelbo.com/uploads/admins/u0/files/20210907122030.pdf
    • https://bibliothequedesarts.ch/ckfinder/userfiles/files/5149046365.pdf
    • http://fotofolliasanlazzaro.it/userfiles/files/3624178048.pdf
    • http://pensionpoint.cz/userfiles/files/39600884871.pdf
    • http://abwingssuffolk2.com/uploads/files/86433174885.pdf
    • http://files.ibiza-ferien.de/file/doginog.pdf
    • http://baoveantam.org/upload/files/82565961967.pdf
    • https://edenestates.com/ckfinder/userfiles/files/2927645382.pdf
    • https://poulinstrapscan.com/userfiles/file/vegabogatoxivefi.pdf
    • https://urbanlivin.lu/userfiles/files/lulufuragimufuvu.pdf
    • https://eastmanllc.com/ckfinder/userfiles/files/tarisurexilelawunutif.pdf
    • https://jf-orvalho.pt/userfiles/file/vibamobimelasigezowusap.pdf
    • https://linhquan-group.com/upload/ck/files/52918750817.pdf
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/65672922140.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=add+microsoft+exchange+email+to+android
    • 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_off0000df01.bin
52bb287ee6114176f44b6ed04de4f0cc7154b467635611cb7eb3fff3f4e534d4
pdf-font-stream PDF embedded font (sfnt) at offset 0xDF01 18804 bytes
font_01_sfnt_off00010fbe.bin
176e24b3bd8b73da7ed0105786c49c7b570df71fbf0f16d29035933c38e03f78
pdf-font-stream PDF embedded font (sfnt) at offset 0x10FBE 11004 bytes
font_02_sfnt_off000128f7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x128F7 16792 bytes