Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e17c1ca3260bb30…

MALICIOUS

PDF

65.1 KB Created: 2021-10-02 11:54:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: ad9077f6d8e70db500c26faaa4685130 SHA-1: f3f2f746712996a0496da8a13a2b120a7417e3a3 SHA-256: 6e17c1ca3260bb3026393c25d0fbc58d1aa0c84f00dd228005beeeb810c1a892
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable hosting, and one heuristic specifically identifies it as a link farm. While the document body is unreadable, the presence of these indicators suggests an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6098

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 http://wangguanhardware.com/userfiles/file/65721082511.pdf In PDF document text
    • http://hanilkwanla.com/uploads/files/gupogotakupavilugibapor.pdfIn PDF document text
    • http://hk-sai.com/ckfinder/userfiles/files/9572843658.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/6771bec9a67a8cb7fff12d872b716580/18067154216.pdfIn PDF document text
    • https://giaynangchieucao.com/userfiles/file/ketitibugedoxufudimululi.pdfIn PDF document text
    • http://mygiftltd.com/userfiles/file/gurisosalonatuvaxi.pdfIn PDF document text
    • http://lianbang123.com/uploads/files/202109031554439400.pdfIn PDF document text
    • http://xn--2e0b30g3uq7pay7m.com/upload/fckeditor/file/dudom.pdfIn PDF document text
    • https://softwebstar.com/shop/userfiles/file/47302334217.pdfIn PDF document text
    • http://nordicwalkingturak.hu/_user/file/pemenumivelebubaxe.pdfIn PDF document text
    • https://leosservices.com/userfiles/file/fuwoxenitigasutumifer.pdfIn PDF document text
    • http://enjoybowlramenandpoke.com/uploads/files/xujomi.pdfIn PDF document text
    • http://alexandersorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zagawuporololilozu.pdfIn PDF document text
    • http://bigbulkbags.ahmadpackages.com/survey/userfiles/files/givuzunulawalagisuzegezus.pdfIn PDF document text
    • https://ecableapp.com/FCKeditor/FCKimgUpload/file/vigiposunosaw.pdfIn PDF document text
    • https://urbanlivin.lu/userfiles/files/rexexibivetusabifitevibiv.pdfIn PDF document text
    • http://short-story.ru/upload/file/subitalevezewatezewizaki.pdfIn PDF document text
    • http://maginsaatmetal.com/resimlerfiles/kabapudumamefebapo.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16136c583af44a---39190656862.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=cecil+textbook+of+medicine+pdf+free+downloadPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000a98b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA98B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c1a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1A2 11064 bytes
SHA-256: bbc153a9536b090d081bef120b01e9a76e151b3a21741e29bce6ed8c74621064
font_02_sfnt_off0000db33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB33 14652 bytes
SHA-256: 4f583ad1678d222b8329f23be97fd0b40fb48325b9de1cc04a3b437e07dc187f

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