Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d99920fc2377874…

MALICIOUS

PDF

86.2 KB Created: 2021-09-23 10:48:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6908905a6f546e8140f963a53256332f SHA-1: 919ee4f991986e9eacf571e42a1e535863a33cb2 SHA-256: 8d99920fc2377874499fdc4abefe4355bbfa7eae1615fb29bdda2de470b1d6ed
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating it functions as a link farm. The presence of numerous unknown URLs suggests a phishing or malware distribution attempt. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of an attempt to trick users into navigating to malicious sites, likely for initial access via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://www.frontiermyanmar.com/sites/all/libraries/ckfinder/userfiles/files/99178395615.pdf
    • http://taxfreepoint.com/file/pidazopomoriwap.pdf
    • https://locktactyuma.com/ckfinder/userfiles/files/zofabenisod.pdf
    • https://a1-recruitment.fr/v2011/Files/fck_upload/file/zoruxukifu.pdf
    • http://phongthuydotho.vn/upload/files/degiwukemesamekowo.pdf
    • https://12shio3.com/contents/files/92195268461.pdf
    • https://cambodiaangkorhomestay.com/userfiles/file/doroke.pdf
    • http://efeteknikyapi.com/userfiles/files/jadiwevikusom.pdf
    • http://svazekobciorlice.cz/userfiles/file/92332963546.pdf
    • http://stardentalcare.org/userfiles/file/xugonotawag.pdf
    • http://thomas-zigon.de/images/file/rexupokabajiro.pdf
    • http://togclick.com/media/userFckfiles/file/77019015037.pdf
    • https://dazhonghua1688.com/ckfinder/userfiles/files/ribukeroxuwubobi.pdf
    • http://vrieshorst.nl/images/uploads/file/rexojeza.pdf
    • http://korsorlampang.net/user_img/files/30553114855.pdf
    • http://goddesshair.net/upload/users/files/57006598723.pdf
    • http://proleague.dk/userfiles/file/pavapuzogogovopimuxoxiro.pdf
    • http://almar-bus.pl/userfiles/file/xamebanisulini.pdf
    • http://abogarestudio.com/userfiles/file/85769038242.pdf
    • https://tarzminder.com/resimler/files/fumikuzupomunanejegulog.pdf
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/p3mmpkak6b887ktv1scp5khlu7/galebexaremolebera.pdf
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147cdff1d2c9---jafuxerakutodorefejiw.pdf
    • https://fratellifurloni.it/file/88654305038.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=nerve+neck+to+arm
    • 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_off0000f00b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF00B 16792 bytes
font_01_sfnt_off00010822.bin
f2cec228b72dbc8747781522ebdf68087bfe7ce61d7dd99dab570be17815f773		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10822 10220 bytes
font_02_sfnt_off00011f18.bin
c7ec0e789a2c13d99c16660218d01abcfc3e8d0c61f75e147e3261d2902bab00		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11F18 17072 bytes

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