Malicious PDF — malware analysis report

Static analysis result for SHA-256 432a3d9ae478a2fd…

MALICIOUS

PDF

68.1 KB Created: 2021-04-11 06:23:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 92d7a9c1929aa32f2c3571f6223d1591 SHA-1: 7f23bb5af0129c51c732aac2ea1e454ab1284339 SHA-256: 432a3d9ae478a2fd367e63e1a3c2705770612f6f04a3a50bd89787bfa082b7ee
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan distribution attempt. It contains numerous embedded URLs, many pointing to disposable domains or link farms, suggesting an attempt to redirect users to malicious sites. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a tactic to artificially inflate search engine rankings for malicious content.

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 http://spotlight-sites.com/sites/default/files/webform/sizewavajifur.pdf
    • https://www.visitsavannah.com/sites/default/files/webform/fukixuliwidopisoduzurapi.pdf
    • https://www.natsihwa.org.au/sites/default/files/webform/19026354442.pdf
    • https://www.newburghgroup.com/sites/default/files/webform/resumes/tikijoti.pdf
    • https://www.dgs-interparts.be/sites/default/files/viwiredozilopuvotudulufez.pdf
    • http://www.birdlifebotswana.org.bw/sites/default/files/webform/sightings-sketches/fipeforivu.pdf
    • https://www.clinicasfantamaria.ro/sites/default/files/webform/33767122539.pdf
    • https://ambrose.edu/sites/default/files/webform/49323480199.pdf
    • https://www.mothercare.ro/sites/default/files/webform/resumes/77861868930.pdf
    • http://www.grotekeukens.be/sites/default/files/webform/gmawards2018/dakatiwilu.pdf
    • http://cicatsalud.com/html/sites/default/files/webform/19824170549.pdf
    • http://pilgrimland.com/sites/default/files/webform/resume-uploads/61975266633.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=cuando+nos+prohibieron+ser+mujeres+p
    • https://printandmail.princeton.edu/system/files/webform/42849177422.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d226.bin
8b78c1145e2baa04afc4e7525666a01b5db1a3faf587f690c581587854b515bc
pdf-font-stream PDF embedded font (sfnt) at offset 0xD226 5288 bytes
font_01_sfnt_off0000e3f0.bin
39ceeadf59768d9452d31ca581fe11a7ec9c49e649e1bd6549fcc946c40ef50b
pdf-font-stream PDF embedded font (sfnt) at offset 0xE3F0 11032 bytes