Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ba2c7d766a4d3df…

MALICIOUS

PDF

65.9 KB Created: 2021-04-16 03:20:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6251dd54275fc1ad467062885fb0909e SHA-1: 988af2ca1c90e09c8bfd029174eef5d186ac9a1d SHA-256: 3ba2c7d766a4d3df7b5dd45edf1e28620d9c4eeaab981c238178d62db39e08e0
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The PDF contains numerous embedded URLs, many pointing to domains that appear to be part of a link farm designed to obscure the ultimate destination. The presence of these links suggests an attempt to redirect users to malicious sites for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://www.natsihwa.org.au/sites/default/files/webform/51762260361.pdf
    • http://portal-mysigma.com/system/files/student-proof/47432021317.pdf
    • https://www.woonsocketri.org/system/temporary/webform/viwubamonutimujogigifowi.pdf
    • http://www.pbttphtk.gov.my/sites/default/files/webform/zoxajetuvu.pdf
    • https://www.mothercare.ro/sites/default/files/webform/resumes/susumijifiwef.pdf
    • https://www.enwidth.com/sites/default/files/webform/resumes/ziwisotug.pdf
    • https://ambrose.edu/sites/default/files/webform/ginigiwosumomigari.pdf
    • http://www.friendlycc.com/sites/default/files/webform/fajabenofedutetigolexid.pdf
    • https://www.dgs-interparts.be/sites/default/files/36138637258.pdf
    • https://www.afscme65.org/system/files/webform/baxuwobokorexifiri.pdf
    • https://ambrose.edu/sites/default/files/webform/65047245793.pdf
    • http://seiary.com/sites/default/files/webform/rec/jizexatunurometubukos.pdf
    • https://www.natsihwa.org.au/sites/default/files/webform/doxuwekuwazomiloxeri.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=integration+of+cos+x%252Fsin%255E2x%252B4sinx%252B5
    • https://drones.princeton.edu/system/files/webform/zifogisabivaloxigisosobu.pdf
    • https://printandmail.princeton.edu/system/files/webform/67925993666.pdf
    • https://ubmemeaensoprod.s3.amazonaws.com/ifsec_international/call_for_papers/2021/03/jonigumeneritid.pdf
    • https://ec.europa.eu/eip/agriculture/sites/default/files/webform/juvuwudonuvusenovirem.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_off0000c4d1.bin
9f8099672492818521d6246105facd03a961247e6da216f44d10c3ba4ab382b1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC4D1 5452 bytes
font_01_sfnt_off0000d7a0.bin
5c08ac74430b77c2662ad245fd7b9bfb2fed091282b8279ec3b165fc30eb5d87		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD7A0 10312 bytes

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