Malicious PDF — malware analysis report

Static analysis result for SHA-256 3327803a741d6715…

MALICIOUS

PDF

75.3 KB Created: 2020-11-26 08:45:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: f8e6b17efb6881a4c19082da9e55bf73 SHA-1: d6c72cd6659df59c8a70e61e81d527a48254d397 SHA-256: 3327803a741d6715117a7cd631ae7928215aa9be3758f3918db99a689aff181d
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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=the+hornet%2527s+nest+parents+guide PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4410004/normal_5f97648b6556f.pdfIn PDF document text
    • https://zidajikivumab.weebly.com/uploads/1/3/4/6/134625594/giwixoref.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374379/normal_5f88f1de18752.pdfIn PDF document text
    • https://boruwimuruliv.weebly.com/uploads/1/3/4/8/134875556/7361642.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457008/normal_5fa4e5a09e262.pdfIn PDF document text
    • https://bunevozobete.weebly.com/uploads/1/3/4/7/134714888/d12e1ba1.pdfIn PDF document text
    • https://kurikezexiwu.weebly.com/uploads/1/3/0/7/130775092/d6798610c30.pdfIn PDF document text
    • https://xapowukugo.weebly.com/uploads/1/3/4/7/134702937/1533464.pdfIn PDF document text
    • https://rofotemajanati.weebly.com/uploads/1/3/4/4/134497193/xadoregife_bamukoden.pdfIn PDF document text
    • https://batatifenosi.weebly.com/uploads/1/3/4/5/134513642/18b4321a853d7.pdfIn PDF document text
    • https://terarawuterojuz.weebly.com/uploads/1/3/0/7/130739827/lalabejumu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409113/normal_5f9b6dd68f8d2.pdfIn PDF document text
    • https://mipirizu.weebly.com/uploads/1/3/2/6/132682564/e085d89a2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/jevopemosod/51223718760.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_off0000dd87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD87 5052 bytes
SHA-256: b30620d53b7aec10bb799449eb8b03eb29ca9f2aa281735cac82e1ed10208e68
font_01_sfnt_off0000eeb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEB2 10308 bytes
SHA-256: e2c676750450d1f7be1044f6048d4c7b490d280ac3b460061a4d21688beaee21
font_02_sfnt_off00011206.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11206 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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