Malicious PDF — malware analysis report

Static analysis result for SHA-256 25ec59cba6fb080e…

MALICIOUS

PDF

72.0 KB Created: 2021-04-17 01:18:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 948937c25bf55c6af35bca10375035dd SHA-1: d1161b6aa5eb528c8a00f3ef9c2c5a8124e31d44 SHA-256: 25ec59cba6fb080e161a7580dc3277ab68272abe703c47a367eb7647a9bb4310
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to domains associated with link farms and disposable hosting, as indicated by the PDF_SEO_DISPOSABLE_LINK_FARM heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with a malicious document designed to redirect users to harmful 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 https://aboss.by/sites/default/files/webform/8474239295.pdf
    • https://aboss.by/sites/default/files/webform/pibodanagulevegomenet.pdf
    • http://spotlight-sites.com/sites/default/files/webform/wokasonexigugeb.pdf
    • http://portal-mysigma.com/system/files/student-proof/9555400870.pdf
    • https://www.enwidth.com/sites/default/files/webform/resumes/90018929780.pdf
    • https://www.blplegal.com/sites/default/files/webform/vogelunejubujapezidugave.pdf
    • https://www.natsihwa.org.au/sites/default/files/webform/17423244846.pdf
    • https://www.osgeurope.com/sites/osg-corporate.dev/files/webform/keborezuvefubivuw.pdf
    • https://www.natsihwa.org.au/sites/default/files/webform/19026354442.pdf
    • http://www.grotekeukens.be/sites/default/files/webform/gmawards2018/dufadurelabakugozuku.pdf
    • http://www.muttypawsacademy.com/sites/default/files/webform/vaccines/40041164747.pdf
    • https://grossenbacher.co.nz/en/system/files/avoidance-training-certificates/13178745316.pdf
    • https://ambrose.edu/sites/default/files/webform/52499587618.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=how+do+i+change+the+time+on+fitbit+charge+hr
    • https://thesanfordschool.asu.edu/sites/default/files/webform/99818817157.pdf
    • https://printandmail.princeton.edu/system/files/webform/54002061309.pdf
    • https://community.princeton.edu/system/files/webform/36479690150.pdf
    • https://community.princeton.edu/system/files/webform/26098210740.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_off0000d994.bin
4a6b533323f9f32110e159966dba18d97a38f1944106509ebf4d6ca02d0ee8ae		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD994 5420 bytes
font_01_sfnt_off0000ebe8.bin
797384b05ef8c5be3555894866935fb984a888257c1aa68ddd260abc0ec32a0f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEBE8 11044 bytes

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