Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8c033d74e2dfc72…

MALICIOUS

PDF

69.9 KB Created: 2021-04-15 10:59:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ebd2437fc10dc172aae87be21fe7d658 SHA-1: efa7adbcf59b46d5176ede11d48ac5a67b0bf991 SHA-256: f8c033d74e2dfc72e62b6a9b48bad3503891d916a38b3a4c69022e1e163b2c57
126 Risk Score

Malware Insights

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

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which are hosted on compromised or disposable domains, suggesting a link farm or redirection scheme. The document body, though heavily obfuscated, contains references to printer support codes, likely a lure to encourage users to click on the malicious links.

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://natsihwa.org.au/sites/default/files/webform/filon.pdf
    • http://www.muttypawsacademy.com/sites/default/files/webform/vaccines/30199048500.pdf
    • https://www.afscme65.org/system/files/webform/rerezuduzolorefa.pdf
    • https://www.enwidth.com/sites/default/files/webform/resumes/75468476758.pdf
    • https://www.jwico.com/sites/default/files/webform/minokoniniwige.pdf
    • http://seiary.com/sites/default/files/webform/rec/pexutagizoniged.pdf
    • https://www.osgeurope.com/sites/osg-corporate.dev/files/webform/memirudomonejusowanasu.pdf
    • http://www.sumnercountyhospital.org/sites/default/files/webform/sixativitav.pdf
    • http://www.pbttphtk.gov.my/sites/default/files/webform/73261430544.pdf
    • https://grossenbacher.co.nz/en/system/files/avoidance-training-certificates/95133977644.pdf
    • https://www.dgs-interparts.be/sites/default/files/60165950635.pdf
    • http://pilgrimland.com/sites/default/files/webform/resume-uploads/2923424149.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=canon+mg3500+support+code+1702
    • https://ec.europa.eu/eip/agriculture/sites/default/files/webform/5272012193.pdf
    • https://printandmail.princeton.edu/system/files/webform/21338807989.pdf
    • https://ubmemeaensoprod.s3.amazonaws.com/ifsec_international/call_for_papers/2021/03/jonigumeneritid.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_off0000d29f.bin
9b263e70df1920ad59abd6a5e7bab33ed1bfa0a843714faf6ce640e915d67b7f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD29F 5960 bytes
font_01_sfnt_off0000e6e1.bin
eab43303ba9addfe30a69955017765d1b0ba144941fee9f72f3f201dcfe32760		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE6E1 10512 bytes

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