Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b6f258ce319dadf…

MALICIOUS

PDF

83.1 KB Created: 2021-09-24 10:23:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c12434bc233c062f02e1198beebef84a SHA-1: 331e277d9c0b49ba35387305ba51fc47fda56cf6 SHA-256: 5b6f258ce319dadf21f59a5ead631154e53f78c0148e4dfc4d98a358565dd0b7
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristic 'SE_CALLBACK_LURE' strongly suggests a callback phishing or tech-support scam, where the user is prompted to call a number. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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.
  • 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 https://aydin-elektrik.com/resimler/files/genuzam.pdf In PDF document text
    • http://www.santabriganti.org/admin/ckfinder/userfiles/files/xokowodikalibojilejozoku.pdfIn PDF document text
    • http://www.supair-lux.hu/ckfinder/userfiles/files/forarivepunawakor.pdfIn PDF document text
    • http://candientushinko.com/images/file/63145792655.pdfIn PDF document text
    • http://cctechlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bepanobifuxetateruguvum.pdfIn PDF document text
    • http://nowator-zpu.pl/userfiles/file/6467852191.pdfIn PDF document text
    • https://www.zolmedis.lt/ckfinder/userfiles/files/padamavawufug.pdfIn PDF document text
    • http://sgrappresentanze.eu/userfiles/files/duzitekigebifuxusida.pdfIn PDF document text
    • https://beauty-full.ru/uploads/files/56138818940.pdfIn PDF document text
    • http://wpklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jikusexomir.pdfIn PDF document text
    • http://aeklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kovixofozeviditifekiw.pdfIn PDF document text
    • https://kiptep.ru/file/pitupadakobudowiz.pdfIn PDF document text
    • http://jrmhandling.nl/upload/file/64418704309.pdfIn PDF document text
    • https://cissud.com/uploads/ck_editor/files/94482743943.pdfIn PDF document text
    • http://gewald.ru/content/Files/79440224826.pdfIn PDF document text
    • http://mmbc.cz/_data/user_files/file/1808880324.pdfIn PDF document text
    • http://vip-cond.ru/userfiles/file/11147176298.pdfIn PDF document text
    • https://tefen67.com/userfiles/files/sapujenesikorugafagis.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/suwaveruxomitimapapufo.pdfIn PDF document text
    • http://vietsaovang.com/uploads/userfiles/file/bekidu.pdfIn PDF document text
    • https://shevtsov-art.com/uploads/files/wuganekexixebe.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/kulezaminopameralek.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=the+sims+mobile+infinite+moneyPDF 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_off0000e0ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0EA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f8fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8FC 18024 bytes
SHA-256: e6350e293d3655faeec1ba5891ea31e5580e63baf1611b89f06a891ac6307944
font_02_sfnt_off00012755.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12755 10432 bytes
SHA-256: 34e8bf075143383300bf766736eab9a340d7b67f0dbc6f0be84b5462eda8efea