Malicious PDF — malware analysis report

Static analysis result for SHA-256 37064e2f0b6f7472…

MALICIOUS

PDF

85.2 KB Created: 2021-09-09 22:47:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b04d29ec948067d586352f3300e1d040 SHA-1: 6b8e97831b613796e810d3d243464e44ace9e323 SHA-256: 37064e2f0b6f74720b481f81f37fc3286109bfd346a2a0590d08b2dfdcdbe29e
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it uses invoice and callback lures, suggesting a social engineering attempt to trick the user. While no scripts were directly extracted, the PDF structure and embedded URLs point towards a phishing campaign, likely involving a malicious link or document download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://vom-ragnaroek.de/uploads/file/8199348530.pdf
    • http://cuathepvangohaiduong.com/images/ckeditor/files/9738479118.pdf
    • http://jar-ted.pl/file/pubejazowilegoli.pdf
    • http://chieucoingason.vn/files/vobosudavurur.pdf
    • http://lokalizacja-gps.pl/userfiles/file/20568708962.pdf
    • https://loyallcanada.ca/editor_files/file/kebikeberabunude.pdf
    • http://arcstema.com/userfiles/files/47055605913.pdf
    • http://www.vljainandco.com/userfiles/files/xoboditilozolawopazokuna.pdf
    • http://thainightjob.com/ckfinder/userfiles/files/11250344416.pdf
    • http://moretonassets.net/userfiles/najura.pdf
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fb7ee215c5---penerivitanasililik.pdf
    • http://sccsfz.org/upload/2021-09/50526662008.pdf
    • http://armiikrajowej36.pl/public/upload/ckfinder/userfiles/files/56069667812.pdf
    • http://dfwarbitrator.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/11498188259.pdf
    • https://mobspace.xyz/web/img/podborky/files/70598803777.pdf
    • https://datenglagi.com/contents/files/mubuwowutumuzek.pdf
    • http://costanzolegal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wivomegorakimazas.pdf
    • http://mini-garden.ru/userfiles/file/54010212157.pdf
    • http://chinajessie.com/seadata/data/uploads/img/file/163085065168.pdf
    • http://4998horo.gmmwireless.com/contents/files/neremifutiloru.pdf
    • http://austria-ex.com/images/blog/file/dutowiga.pdf
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/161371f0dd7b16---jiwidilogidopuwiri.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=how+to+change+default+save+location+contacts+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_off0000e618.bin
2fa8a7f028cc76b507859b356d8bac76b1daf410c3760fa3eb60fe6c1acd47fb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE618 18420 bytes
font_01_sfnt_off00011552.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11552 16792 bytes
font_02_sfnt_off00012d69.bin
afecc70215a4e2b94b810712b788dda82a0a90b374b00683cb876c2406836108		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12D69 11000 bytes

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