Malicious PDF — malware analysis report

Static analysis result for SHA-256 860ae646adc7b1c0…

MALICIOUS

PDF

73.2 KB Created: 2021-09-09 12:15:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bd02b5a1a84ae743d79a173d2098448a SHA-1: 8016861dc57f4ad9edfe6e8fed5789381f47985a SHA-256: 860ae646adc7b1c00fff322bc3b7d352384d5b09d1a66a30c098946c92a17aeb
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs pointing to a link farm hosted on disposable domains, indicating a phishing or malware distribution attempt. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically identifies this pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://fusen-es.info/yamituki-n/uploads/files/34650472202.pdf
    • http://dominant.name/userfiles/file/15191596294.pdf
    • https://chowdhurytourism.com/ckfinder/userfiles/files/51138052388.pdf
    • http://gowowdeli.com/uploads/files/laferigowugapibivapawemo.pdf
    • http://www.shjkyq.com/up_files/FCK/file/37123042935.pdf
    • http://sushimura1.com/uploads/files/vuwoju.pdf
    • http://iphysiology.ru/upload/javevetipazeduzoju.pdf
    • https://hippodrome-compiegne.fr/www/uploads/file/vasebebiniwefefutot.pdf
    • http://tageedesign.com/ssmpt/documents/file/43757595218.pdf
    • http://aow.infogestnet.it/ckfinder/userfiles/files/lanijabe.pdf
    • https://ls-machinery.com/uploadpic/files/202109090408425218.pdf
    • http://sunnyten.net/userData/board/file/xulozebewul.pdf
    • http://sonhanint.com/uploadpic/sun/files/202109010730256465.pdf
    • http://agisma.ru/files/pages/files/92710128091.pdf
    • http://itcbeautytrainingschool.com/userfiles/file/kaxuxudobaredut.pdf
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130677612454---xobuxatok.pdf
    • https://adurucui.com/ckfinder/files/wozejudimiso.pdf
    • https://dintek.eu/uploads/file/97643398654.pdf
    • http://srmtteaparty.com/uploads/files/202109022134086162.pdf
    • https://mancomunidadvaldizarbe.com/userfiles/files/6498730476.pdf
    • http://rafaelstore.ru/upload/files/sipod.pdf
    • http://yourhandmadeitems.com/userfiles/file/49443106806.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=interval+rate+of+change
    • 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_off0000bacd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBACD 16792 bytes
font_01_sfnt_off0000d2e4.bin
df2ca9feaed9c0a1866f34ff504315ce1882b2eeef653fbdcc4e86ffaf3362e3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD2E4 10372 bytes
font_02_sfnt_off0000ea52.bin
f2776ddc2b2c9d2b6f76b5600b14558aebdd490e306fe5a21d2033a4c4f6be82		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA52 17504 bytes

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