Malicious PDF — malware analysis report

Static analysis result for SHA-256 8231007fdb05cbf1…

MALICIOUS

PDF

81.5 KB Created: 2021-09-11 21:21:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 110da895cd7ddf94316c929a401acf1d SHA-1: adda7f4306dada69d4d0110e8516bb9dcd5ffb4d SHA-256: 8231007fdb05cbf1c0f3e10ec863db74c4f1256bb879a3196dfeb22b55b3a859
226 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF file was flagged by ML classifiers and ClamAV as malicious, exhibiting lures for browser extension installation and payment redirection. These tactics are commonly used in phishing and business email compromise attacks to trick users into compromising their systems or financial information. No scripts were extracted, but the embedded URLs and heuristic firings strongly suggest a phishing or BEC attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise pattern
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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.
  • 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://retailcop.ca/files/45121606798.pdf In PDF document text
    • http://wisdomtours.net/upload/file/jadagupogozo.pdfIn PDF document text
    • https://joebalogh.ro/imagini_ws/17642426227.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/161347a45e8bf1---30843949800.pdfIn PDF document text
    • https://dichvuketoanvn.org/uploads/files/42561850740.pdfIn PDF document text
    • https://sentinels.ro/userfiles/file/busorakivurinexobin.pdfIn PDF document text
    • http://zoop-tech.com/ckfinder/userfiles/files/38894324993.pdfIn PDF document text
    • http://atsrealtyvietnam.com/upload/files/21441981444.pdfIn PDF document text
    • http://nhactheducthammy.com/upload/files/50960332189.pdfIn PDF document text
    • https://plantbiochem.com/ckfinder/userfiles/files/pisagiwujopimajifoboruja.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/98sjrge2ajtrkgt4t3mhhavsq1/76269895548.pdfIn PDF document text
    • https://kga-am-adlergestell-ev.de/kga/ckfinder/userfiles/files/tojafusemijaxipubeditu.pdfIn PDF document text
    • http://ufcnagykanizsa.hu/userfiles/file/gemalokujisegopetanenun.pdfIn PDF document text
    • http://daegyung.kr/userfiles/file/20210908102046.pdfIn PDF document text
    • https://scavilecis.it/userfiles/file/66266755893.pdfIn PDF document text
    • http://www.southforconstruction.com/frontend/web/ckfinder/userfiles/files/75295936731.pdfIn PDF document text
    • http://decorstore.eu/upload/file/wesuwejusumufan.pdfIn PDF document text
    • https://printjet.pl/pliki_user/File/duzedepodiwivib.pdfIn PDF document text
    • https://invest.pl/userfiles/file/56240954042.pdfIn PDF document text
    • https://ph789.com/pinhsuan/files/file/18154386539.pdfIn PDF document text
    • http://worldsocialistpartyindia.org/ckfinder/userfiles/files/10121254946.pdfIn PDF document text
    • http://soluzionebenessere.eu/userfiles/files/86923232831.pdfIn PDF document text
    • http://prmakeup.com/Image/files/78254926448.pdfIn PDF document text
    • http://skogsformedling.se/bilder_umeny/File/fededinaviwetaseraje.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=how+to+delete+my+google+account+from+my+android+phonePDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • 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_off0000d6b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6B3 11188 bytes
SHA-256: 482b69635194d58e25a12f4a4cf1ed59f2cc1b1ad7964d209fb8f045848d0f9f
font_01_sfnt_off0000f077.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF077 18436 bytes
SHA-256: 299a04bfee47690c5b296254641683b241cc97e046a1d050bcec26bd92c4a6fd
font_02_sfnt_off00012034.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12034 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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