Malicious PDF — malware analysis report

Static analysis result for SHA-256 69c3e8cb18595001…

MALICIOUS

PDF

78.3 KB Created: 2021-03-28 21:07:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0b0e3d00e913776a0e0beb7d9a2b98b3 SHA-1: 7290b27737c99b36ade125d66128a4415e0d8457 SHA-256: 69c3e8cb18595001c39596016b25967398468ab932aaeef1c5d8f72ea8af945a
206 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, many hosted on disposable domains, indicative of a link farm designed to redirect users to malicious content. The heuristic 'SE_CALLBACK_LURE' suggests a phishing or scam pretext, and the presence of numerous external URIs supports this, likely aiming to trick users into visiting compromised sites for fraudulent purposes. Although no scripts were explicitly extracted, the ML classifier and ClamAV detection strongly indicate malicious intent, likely involving redirection to exploit kits or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 7

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://ponafet.ru/strik?utm_term=cyberpunk+2077+ps4+refund+email
    • http://choosemadam.site/fluke_337_repairvzvm1.pdf
    • https://kominalekawer.weebly.com/uploads/1/3/1/6/131636772/texexorirude_zopul_bifani_jojaveb.pdf
    • https://cdn.sqhk.co/nolovojawek/fxgbhck/univision_novelas_cennet.pdf
    • http://mavpa.fun/95995828930k4mdg.pdf
    • https://tiposowa.weebly.com/uploads/1/3/1/1/131164246/robamagebiwapida.pdf
    • https://cdn.sqhk.co/fagaxirupunu/jdjibje/solitaire_free_download_windows_10.pdf
    • https://bejolikide.weebly.com/uploads/1/3/1/4/131437094/6742863.pdf
    • https://fumirufax.weebly.com/uploads/1/3/1/8/131856188/temom.pdf
    • https://kitivagep.weebly.com/uploads/1/3/0/7/130775950/c44730409dea0cf.pdf
    • https://wovadipe.weebly.com/uploads/1/3/4/4/134462462/dabakepafo.pdf
    • http://giveaway2020.info/safety_mask_from_virusfpq35.pdf
    • https://sovevalejuwup.weebly.com/uploads/1/3/1/8/131858043/relojaku.pdf
    • https://mofutobanu.weebly.com/uploads/1/3/1/3/131383854/1931483.pdf
    • https://xesaranit.weebly.com/uploads/1/3/2/6/132696194/mulikekuwotim_kusubarokeva_xakuv.pdf
    • http://domensita.fun/wogakelexejojuba45ds4.pdf
    • https://zokelafeg.weebly.com/uploads/1/3/4/8/134889419/rizob.pdf
    • https://nebutoribuve.weebly.com/uploads/1/3/4/6/134615115/8a11a.pdf
    • https://jabibodusap.weebly.com/uploads/1/3/2/6/132681053/010319.pdf
    • https://cdn.sqhk.co/zagusebipin/aijidOh/12879905918.pdf
    • https://cdn.sqhk.co/bidufewo/zl0cihf/13921394650.pdf
    • https://luwojasog.weebly.com/uploads/1/3/1/3/131380471/rerasosaxipesuwabej.pdf
    • https://jopakawinotu.weebly.com/uploads/1/3/1/4/131407654/tubedusugoduw.pdf
    • https://sodumixiseto.weebly.com/uploads/1/3/4/3/134311801/fabefemi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef79.bin
fad89b42893299f8a5248cfded50a9ddb36ddced76599ae4ad8bc9af68b014ee		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF79 5840 bytes
font_01_sfnt_off00010355.bin
64405372258d17fd69da912b0dfa9df55fb84bd0b3eb664a34ba85d465b32b82		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10355 11448 bytes

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