Malicious PDF — malware analysis report

Static analysis result for SHA-256 44108dda1daef033…

MALICIOUS

PDF

68.3 KB Created: 2021-01-15 22:04:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: da02f771f19612f6fd7c301584a831f4 SHA-1: 43dc3eea07d25efb1cfcd8e8f29d963ac30bbdfc SHA-256: 44108dda1daef0338d4245f569fa5ca05b9525cbf3f0d49d5cbe8face06b80a7
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to disposable hosting services, suggesting a link farm designed to redirect users to potentially malicious content or phishing sites. The presence of external URIs and the 'link farm' heuristic strongly support a phishing or malware distribution attack pattern.

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://traffset.ru/123?utm_term=personal+representative+deed+wisconsin PDF link annotation
    • https://nogigeto.weebly.com/uploads/1/3/4/6/134665346/jomejetimili.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379742/normal_5fcd967d511f1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486552/normal_5fd9e578c5ab3.pdfIn PDF document text
    • https://bugajikiwolano.weebly.com/uploads/1/3/4/4/134471946/matusuguwamuxikokat.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367290/normal_5f9a14196b142.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425723/normal_5fc946f1c6440.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460680/normal_5ffd03ceea971.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467586/normal_5fb4bdab8e605.pdfIn PDF document text
    • https://site-1176298.mozfiles.com/files/1176298/kawadivipasevufeso.pdfIn PDF document text
    • https://mavezuwunokil.weebly.com/uploads/1/3/4/6/134627141/vurupanaduwalito.pdfIn PDF document text
    • https://site-1173572.mozfiles.com/files/1173572/female_movie_stars_then_and_now.pdfIn PDF document text
    • https://site-1217839.mozfiles.com/files/1217839/depreciation_schedule_excel_template.pdfIn PDF document text
    • https://site-1174730.mozfiles.com/files/1174730/pigobuwajijunujodeti.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cc95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC95 5220 bytes
SHA-256: efacb89dba73f9d716a969a9f5ee9168b5271ad791b789c64831cdd59ad2d851
font_01_sfnt_off0000de79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE79 11152 bytes
SHA-256: 52e2ea6b3fc20ef80bf7b2a6659d078f57c736ab6525a48975bdb52449a33bd2

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