Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff32ece0a72b3383…

MALICIOUS

PDF

96.8 KB Created: 2021-10-19 03:45:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 0f29f383706b0bfe736243bea7aab79d SHA-1: 7c5bd03a042e9e3136be082309a90212433852d8 SHA-256: ff32ece0a72b3383f25d25a22f9e6072b25622b36f0f95da8949a5e92e683e82
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm and contains a callback phishing lure, prompting users to call a number for a fake issue. While no scripts were directly extracted, the nature of the PDF and its embedded links suggest it is designed to trick users into fraudulent phone interactions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://sanyosushiglendora.com/uploads/files/xijuzuvobug.pdf In PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/8d929e9e36b82909304630161d3eaa89/datipumafo.pdfIn PDF document text
    • http://agedwedfjtj.pretty-match.com/upload/files/79103846667.pdfIn PDF document text
    • http://flyingfish-stay.com/userfiles/file/bakujenefida.pdfIn PDF document text
    • http://tourhong.com/FileData/ckfinder/files/20210920_7BE06B34C2BD47E5.pdfIn PDF document text
    • http://sahrugs.com/userfiles/file/doroli.pdfIn PDF document text
    • http://vetsnab32.ru/userfiles/file/vamoxigakad.pdfIn PDF document text
    • http://dui-antidote.net/images/userfiles/file/96369811903.pdfIn PDF document text
    • http://fc-junajted.com/upload/datoteke/jabomo.pdfIn PDF document text
    • http://drivescuolaguida.it/userfiles/files/firolijarebadeva.pdfIn PDF document text
    • http://macierz-grodziec.org/files/file/dawaluvadomulowofipo.pdfIn PDF document text
    • http://wojno-stal.pl/pliki/file/xaviwidesi.pdfIn PDF document text
    • http://easytravel63.ru/ckfinder/userfiles/files/46530318615.pdfIn PDF document text
    • http://www.cpiequipos.com/assets/images/user_files/files/xajasutirowanor.pdfIn PDF document text
    • http://www.jysunshine-hotel.com/up_files/file/71834087953.pdfIn PDF document text
    • http://baracenter.be/userfiles/file/57881572685.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/64015336455.pdfIn PDF document text
    • http://arkystudio.eu/userfiles/files/sofajezavog.pdfIn PDF document text
    • http://duythuc-bearing.vn/uploads/userfiles/file/lubonu.pdfIn PDF document text
    • https://comtraining.cl/userfiles/files/guzujanufegifepufigimap.pdfIn PDF document text
    • http://autoklej.pl/app/webroot/media/files/woziritamin.pdfIn PDF document text
    • http://siamsankyo.com/Uploads/file/27218679535.pdfIn PDF document text
    • https://www.nvsrolko.org/ckfinder/userfiles/files/jalixajapexevomevigomi.pdfIn PDF document text
    • https://asiahealthcaredentalcentre.com/ckfinder/userfiles/files/zelodojom.pdfIn PDF document text
    • https://bursac.net/userfiles/file/wexitaxifexakitoxodubeber.pdfIn PDF document text
    • http://feedproxy.google.com/~r/Xvkpad/~3/1hHberoKktI/uplcv?utm_term=income+affidavit+format+in+malayalamPDF 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_off0001128d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1128D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012aa4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AA4 10600 bytes
SHA-256: 0c3a8ed54fc42fc63160f795397d7a19c5d60fccd5569a080a467f091f4a1895
font_02_sfnt_off000142cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142CF 19316 bytes
SHA-256: e24322f7d250b0f33bbcca809a19b79a4ffd83b0422bfecd2652d36002b557c4