Malicious PDF — malware analysis report

Static analysis result for SHA-256 c173c8bd15c0e824…

MALICIOUS

PDF

70.4 KB Created: 2021-02-18 03:00:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 10d1b006378d9f06b40b3b5b7f424a5d SHA-1: 0dde1d4c6d6275db92591237c2efb1d77c92544e SHA-256: c173c8bd15c0e824cb3f6dc817d7da95b8d1a27da389ddfa9565faf3fd6303de
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests it's part of a link farm designed to distribute malicious content. The embedded URL points to a suspicious domain, likely serving as a lure for phishing or malware download.

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://maypoin.ru/wix?keyword=scar+tissue+pdf+ita PDF link annotation
    • https://zutuvibob.weebly.com/uploads/1/3/1/4/131407898/14ff3d4b92e.pdfIn PDF document text
    • http://afterdealer.pro/dozutox3nqyv.pdfIn PDF document text
    • https://kelebewo.weebly.com/uploads/1/3/4/3/134359650/fivojene.pdfIn PDF document text
    • https://mirulunus.weebly.com/uploads/1/3/1/1/131164386/9593319.pdfIn PDF document text
    • http://usblighter24.site/kapalalgi098.pdfIn PDF document text
    • https://vabeliguteziji.weebly.com/uploads/1/3/1/3/131379360/tijugobatomo-xuzupatakunaju-menisab.pdfIn PDF document text
    • https://gomafaned.weebly.com/uploads/1/3/5/2/135296522/6857760.pdfIn PDF document text
    • https://kezagoguz.weebly.com/uploads/1/3/4/1/134131769/d79b9dd.pdfIn PDF document text
    • http://pestore.pro/66841421073s3id7.pdfIn PDF document text
    • http://dithetsen.xyz/junior_waec_syllabusozxg0.pdfIn PDF document text
    • http://izzzaaa.space/60170083818vdo4l.pdfIn PDF document text
    • http://fitdieta.com/gokivoderik24wp2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374963/normal_6006de95d28d3.pdfIn PDF document text
    • https://bagirarivevi.weebly.com/uploads/1/3/1/3/131384609/gogomefu.pdfIn PDF document text
    • https://mulunumidivopiz.weebly.com/uploads/1/3/5/3/135393794/6546956.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/davolazupivowi/chrome_75._0_version.pdfIn PDF document text
    • https://s3.amazonaws.com/xifabilejilab/assam_tet_exam_2019_syllabus.pdfIn PDF document text
    • https://s3.amazonaws.com/jixeremipet/what_does_warm_and_fuzzy_feeling_mean.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d678.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD678 5220 bytes
SHA-256: 5ebee9f905a67ce22bc08dbde0a336e1e04c0e3882fc05ec53762b96415b9879
font_01_sfnt_off0000e850.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE850 10336 bytes
SHA-256: 211d95fd5b22ff5d8654b7462c3b13e88277a7f03dedb5440ad07fc1aa8e7a9c

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