Malicious PDF — malware analysis report

Static analysis result for SHA-256 f85cb7b2a440331a…

MALICIOUS

PDF

82.3 KB Created: 2020-11-25 05:43:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 5a4ecf7fc3af0d275311bc1eb0f2a131 SHA-1: 100e3cce6ef4020388951f33427f4c51e9c123cc SHA-256: f85cb7b2a440331a7170e68b7f36433c23f4a6f2d8aff0a224c037df7967dca3
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://trafffi.ru/123?utm_term=ymca+salisbury+md+summer+camp PDF link annotation
    • https://zegimobigew.weebly.com/uploads/1/3/4/3/134313375/zigojojivubi.pdfIn PDF document text
    • https://bajusumuke.weebly.com/uploads/1/3/2/7/132741128/8096751.pdfIn PDF document text
    • https://fozunisomizu.weebly.com/uploads/1/3/4/6/134666093/zepanesixor.pdfIn PDF document text
    • https://vaxevadokipab.weebly.com/uploads/1/3/4/6/134610393/nekigox.pdfIn PDF document text
    • https://mazifufozabi.weebly.com/uploads/1/3/4/6/134690202/5638041.pdfIn PDF document text
    • https://diveziriluro.weebly.com/uploads/1/3/4/4/134447321/bd8d8dce7ab7c69.pdfIn PDF document text
    • https://fewefemuge.weebly.com/uploads/1/3/4/3/134372507/1319014.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/mubemutolewe/zizutagodaxugiminebuwevum.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/647774d5-6fdf-457d-85b1-cab9c9db20e6/nero_8_serial.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8e9271cc-0f66-40d9-996f-c3ab182fdf3c/31356868088.pdfIn PDF document text
    • https://s3.amazonaws.com/pazifetanegapu/69051661431.pdfIn PDF document text
    • https://s3.amazonaws.com/fedufiporara/yu_liu_md_compass.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_off00010448.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10448 5424 bytes
SHA-256: d1e697beb41656bbb0bedf6e7901631c628de4511a9ecaf95ac01fe03f59d120
font_01_sfnt_off0001169e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1169E 11140 bytes
SHA-256: c58c2fc041c811467840da6409c7268358409e73d098a4a70b8e22ddccc43909

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