Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a450c43188e6df1…

MALICIOUS

PDF

88.8 KB Created: 2021-04-06 22:10:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 1682c133df3db1daee5ba0648afbfe5c SHA-1: f0f34598b985058f3f8084b91138fd1b7d1e1943 SHA-256: 1a450c43188e6df13e377cb25f7b250bc4e62a2e04a6e9f5c232b3084306da89
126 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan' and a machine learning classifier assigned a high probability of maliciousness. It contains numerous embedded URLs, many of which point to disposable hosting or are part of link farms, suggesting a phishing or spamming operation. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate it's designed to redirect users to external sites, potentially for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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.uts.cw/sites/default/files/webform/50818196885.pdf In PDF document text
    • https://www.a1touchsolution.nl/sites/default/files/kobovigub.pdfIn PDF document text
    • https://ambrose.edu/sites/default/files/webform/20598750849.pdfIn PDF document text
    • http://pilgrimland.com/sites/default/files/webform/resume-uploads/52872338461.pdfIn PDF document text
    • https://www.afscme65.org/system/files/webform/52844377902.pdfIn PDF document text
    • http://www.pbttphtk.gov.my/sites/default/files/webform/32056102714.pdfIn PDF document text
    • http://www.grotekeukens.be/sites/default/files/webform/gmawards2018/gurolaxi.pdfIn PDF document text
    • https://www.woonsocketri.org/system/temporary/webform/54194604641.pdfIn PDF document text
    • https://www.natsihwa.org.au/sites/default/files/webform/81826716543.pdfIn PDF document text
    • https://ambrose.edu/sites/default/files/webform/ginigiwosumomigari.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=fisiopatologia+da+anemia+ferropriva+pdfPDF link annotation
    • https://community.princeton.edu/system/files/webform/setokan.pdfIn PDF document text
    • https://lib.asu.edu/system/files/webform/delibenapu.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010269.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10269 5376 bytes
SHA-256: a48dcac79997a965c2e16d605146a22deb00bdea42eefbf2efbf0d90d04ec8cb
font_01_sfnt_off000114a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114A8 14320 bytes
SHA-256: 967bdb8c0c6ab5859cb7f8b410b841a41ae02f7b785970fdb262034cf4d03c08
font_02_sfnt_off00013f4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F4C 16060 bytes
SHA-256: 503f5200e83b189a546b6c6e1d808633a9135186956fe76ff9bd78de3d91e3c6

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