Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a4955d3e832e51c…

MALICIOUS

PDF

71.7 KB Created: 2021-04-11 16:09:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1fe3411edb199c39a581169915c1b9cd SHA-1: eb4461b3eeec380eefbed5dd2b6a457224aacd8f SHA-256: 5a4955d3e832e51cfda605a5d37acb2ac0f2bf93311943f282b9cd7c44900b52
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 trojan. It contains numerous embedded URLs, many pointing to disposable domains or link farms, suggesting an attempt to redirect users to malicious sites. The document body, though heavily obfuscated, contains text that appears to be a 'Core belief worksheet', a common lure for phishing or scam operations.

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 http://oaklandchildcare.org/sites/default/files/webform/80411930416.pdf
    • http://www.friendlycc.com/sites/default/files/webform/zuguxinukebezukul.pdf
    • https://ambrose.edu/sites/default/files/webform/54125375098.pdf
    • http://www.grotekeukens.be/sites/default/files/webform/gmawards2018/98751459569.pdf
    • http://www.guninetwork.org/system/files/webform/heirri_proposals/74543186253.pdf
    • http://oaklandchildcare.org/sites/default/files/webform/wafawujozovu.pdf
    • https://www.jsif.org/sites/default/files/webform/54250685962.pdf
    • http://cicatsalud.com/html/sites/default/files/webform/21030689395.pdf
    • https://ambrose.edu/sites/default/files/webform/natogaj.pdf
    • https://ambrose.edu/sites/default/files/webform/61391242106.pdf
    • http://cicatsalud.com/html/sites/default/files/webform/mulakipezumaxusilexuvu.pdf
    • http://www.muttypawsacademy.com/sites/default/files/webform/vaccines/lomaxitafuvutatu.pdf
    • https://www.osgeurope.com/sites/osg-corporate.dev/files/webform/3563422068.pdf
    • https://extranet.blanchisserie-toulousaine-de-sante.com/sites/extranet.blanchisserie-toulousaine-de-sante.com/files/documents/justificatifs/ratasivovo.pdf
    • https://aboss.by/sites/default/files/webform/12132802610.pdf
    • http://cicatsalud.com/html/sites/default/files/webform/sidetarebuw.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=core+belief+worksheet
    • https://ubmemeaensoprod.s3.amazonaws.com/ifsec_international/call_for_papers/2021/03/37488496184.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_off0000de30.bin
3d4423ad5209d7d64fcc90c1beb2b50b197d01423f41e4bd31727a9959ecb0b6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDE30 4844 bytes
font_01_sfnt_off0000eeb8.bin
d79aa4de7df9b5ad7ecde08193008beca2dd473e192be2f3762428466a82e075		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEEB8 10312 bytes

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