Malicious PDF — malware analysis report

Static analysis result for SHA-256 76eb3170ba73f3c8…

MALICIOUS

PDF

71.4 KB Created: 2021-02-17 19:10:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: a3b602986a286b85afc3b318dda18627 SHA-1: ebe42e339acd8681ed22c81d7f31c85371f58e23 SHA-256: 76eb3170ba73f3c885c2d2ed1d0328bce3d52a61fb2437165489c66f0133be57
126 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains multiple external URLs, including one that appears to be a redirector with UTM parameters, and another hosted on disposable infrastructure. The document body, though heavily obfuscated, contains text related to 'Tamu dining plans', suggesting a phishing or scam lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • 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://baarspo.ru/123?utm_term=tamu+dining+plans PDF link annotation
    • http://strahauto.website/assassins_tv_guide_repo3tycv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368468/normal_6027647eb9e1e.pdfIn PDF document text
    • http://help-lnstagramcopyrights-verify.com/nojodosatenabirejazotulilhit43.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392209/normal_601a1b3a20aaf.pdfIn PDF document text
    • https://sowibize.weebly.com/uploads/1/3/5/3/135348762/lomijab_deboriredi_tuzorebo_pufoles.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4500887/normal_5fcec0c32d77a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412780/normal_5fe2aed14df74.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454052/normal_5fe817cf37f81.pdfIn PDF document text
    • https://gimuloge.weebly.com/uploads/1/3/0/7/130775506/lodobugosag-medefokedajeved-sutolale-kofulu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402951/normal_5ffec00e04d1b.pdfIn PDF document text
    • http://ingmijn.com/vusagupolarosigivataytsud.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/lixisariwulo/gopud.pdfIn PDF document text
    • 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d841.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD841 5132 bytes
SHA-256: 6f4e94d4f4f52fdba2b7115b0c3810c19701b0cd35ac73ed2d019fc02910c02b
font_01_sfnt_off0000e9a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9A8 11748 bytes
SHA-256: 3bf758189abacc7b2ad56c7c9ef9eb433e0d449b5247b2aef6cd6aebdf14fb0d

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