Malicious PDF — malware analysis report

Static analysis result for SHA-256 b221a22d939e585c…

MALICIOUS

PDF

74.2 KB Created: 2021-01-10 10:06:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 26328e16bb9dda00720df7910f46ea71 SHA-1: ce9e4512ddf5711778a896f5e28e2a0fdaf2b3b5 SHA-256: b221a22d939e585caea59de8716ba20da9f4ef5a4ed4dfadab96c2983ced6d57
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains multiple embedded URLs, with the primary lure being 'Sims 3 worlds with all expansions'. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for link farms, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to malicious sites for credential harvesting or further payload 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://trafftec.ru/123?utm_term=sims+3+worlds+with+all+expansions PDF link annotation
    • https://jemajodelevo.weebly.com/uploads/1/3/4/3/134394711/wupav.pdfIn PDF document text
    • https://site-1191940.mozfiles.com/files/1191940/bunujufon.pdfIn PDF document text
    • https://xilorufanil.weebly.com/uploads/1/3/0/7/130739938/zageniforuzoba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404524/normal_5fa6295a9fdcf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404497/normal_5fc3cecf5f82b.pdfIn PDF document text
    • https://zugasunisozabij.weebly.com/uploads/1/3/4/7/134759734/dekovuxewuri.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477139/normal_5fd771d80606b.pdfIn PDF document text
    • https://wesaxewotivaf.weebly.com/uploads/1/3/4/5/134578523/8067972.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421944/normal_5fdf1cca52078.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/xovajukoxin/sentencing_guidelines_burglary.pdfIn PDF document text
    • https://s3.amazonaws.com/tesapibebujep/raja_babu_song_3gp.pdfIn PDF document text
    • https://s3.amazonaws.com/mokamoba/filmora_trailer_templates.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB98 5624 bytes
SHA-256: f76edc69117aeb177e8ff4b3b678a93d143554d52cd7cd5b9f640e67f5e9eef9
font_01_sfnt_off0000ee94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE94 2132 bytes
SHA-256: 63e783c03da57879afb775159473c506eb962ef38e1d93fd37c9511de6b0a0ad
font_02_sfnt_off0000f851.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF851 10336 bytes
SHA-256: e0e19e61ac68411d1be0a92a909430838a8754b3b991fa9a0380d85c9bba8c99

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