Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4f403ffd28fc97e…

MALICIOUS

PDF

73.6 KB Created: 2021-04-07 18:54:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a44c00f73e9444f7be70aac577c06271 SHA-1: 0ec3e983a6a4ebe9ff46f3a733408f3950d82f23 SHA-256: f4f403ffd28fc97e6e95cfb85ed6f2561c7de7d4e3342b02630f22a23d4934a4
126 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, and it contains numerous external URLs. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. While no scripts were explicitly extracted, the presence of external URIs and the overall detection profile strongly suggest the PDF is intended to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://druttle.ru/123?utm_term=characteristics+of+quality+management+information+system
    • https://cdn-cms.f-static.net/uploads/4446379/normal_600c411d01aa1.pdf
    • http://degakak.sportsontheweb.net/69971703377.pdf
    • https://cdn.sqhk.co/fukonovum/jP29Ihe/tisujufazojituwewasoluse.pdf
    • https://nefabilaj.weebly.com/uploads/1/3/1/4/131438225/4180439.pdf
    • http://kexedeziferu.sportsontheweb.net/we_the_animals_characters.pdf
    • http://zosoxefu.22web.org/96523448993.pdf
    • http://kedozupo.iblogger.org/andhra_pradesh_history_books_in_english.pdf
    • http://kupiokno.su/arkansas_driving_test_scheduleftoeb.pdf
    • https://sifameduj.weebly.com/uploads/1/3/4/5/134522790/d4f9fb.pdf
    • https://static.s123-cdn-static.com/uploads/4490918/normal_5fefcfdc718ac.pdf
    • http://microbladingeyebrowsdallastx.com/acunetix_web_freemdfak.pdf
    • https://cdn.sqhk.co/mukujoripu/nnhjjdC/soccer_heads_champions_league_2014_15_unblocked.pdf
    • https://koxizekeb.weebly.com/uploads/1/3/4/7/134770308/c9ed55833.pdf
    • https://cdn-cms.f-static.net/uploads/4449185/normal_6052e96e345ec.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://rofeluw.epizy.com/healthcare_quality_assurance_manual.pdf
    • 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_off0000e414.bin
8fac588eec55a690d191d144d0adef79eba49f3b63d087d7c10907e8d7c40764		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE414 5428 bytes
font_01_sfnt_off0000f666.bin
d57972c6e514253452a48d0e69360be4f66e73872ec93a478dd67dcb16e8cb96		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF666 10188 bytes

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