Malicious PDF — malware analysis report

Static analysis result for SHA-256 58f95bd4ae377fe2…

MALICIOUS

PDF

83.4 KB Created: 2021-09-12 01:51:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e20d48d7febc05a13ee670b1df82baea SHA-1: 62590837d78b0a18f83a8beb82cbb798062732ef SHA-256: 58f95bd4ae377fe2454e16c57a6f743f92861a570b581480451f2e3edda14db8
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample 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 document prompts the user to make a phone call. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing attempt, likely using embedded JavaScript for obfuscation or redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://www.badischer-kunstverein.de/ckfinder/userfiles/files/gegorobef.pdf In PDF document text
    • https://2ruoteexpo.it/ckfinder/userfiles/files/97235249660.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f7a6f8cce2---4769367376.pdfIn PDF document text
    • https://dursunguney.com/userfiles/files/88534502635.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/94882276531.pdfIn PDF document text
    • http://mptech.vn/ckfinder/userfiles/files/tulunopefiwurot.pdfIn PDF document text
    • https://burragebrothers.com/demo/jolie/beta/userfiles/files/19019703452.pdfIn PDF document text
    • http://climacom.eu/userfiles/files/29011221515.pdfIn PDF document text
    • http://strap.sk/uploads/files/rojuwuvatorale.pdfIn PDF document text
    • https://e-ceramika.pl/userfiles/file/konuxuwibad.pdfIn PDF document text
    • http://hk-sai.com/ckfinder/userfiles/files/rawoxume.pdfIn PDF document text
    • http://timebymtm.com/upload/files/gowibezixowadowox.pdfIn PDF document text
    • https://feldmann.pl/userfiles/file/48862617219.pdfIn PDF document text
    • https://apc-algercentre.dz/ckfinder/userfiles/files/78306318737.pdfIn PDF document text
    • http://ckm-machinery.com/userfiles/files/jipamedaw.pdfIn PDF document text
    • http://planet-for-events.de/userfiles/file/59822740672.pdfIn PDF document text
    • https://gad-elhak.com/userfiles/file/tisipigimevojizowi.pdfIn PDF document text
    • https://s-h.cc/uploads/files/202109060432108879.pdfIn PDF document text
    • https://mlspoland.co/files/file/4047425840.pdfIn PDF document text
    • https://airflow-skateboards.com/userfiles/files/xokurovimi.pdfIn PDF document text
    • https://mwasafat.com/uploads/files/39650999984.pdfIn PDF document text
    • https://zibarajabi.com/cache/fck_files/file/94108959388.pdfIn PDF document text
    • http://phutunggiahungoto.com/uploads/files/4717640886.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=play+ds+games+on+androidPDF 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_off0000e1da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1DA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f9ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9EC 18016 bytes
SHA-256: dbc395895bd133736beb062748618e486ee6665a55006d493c0f8c312f060e9d
font_02_sfnt_off0001282b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1282B 10608 bytes
SHA-256: 1eb100ff68538b2117c53ed99fbe00f0ce55aa97bcde175faf1bb3d5d332a86f