Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e9e86f8a1808c56…

MALICIOUS

PDF

38.3 KB Created: 2020-11-05 20:02:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: d7ab253b45a2f11d0f1d4fa72310e1e8 SHA-1: db32f54e6be362bd882c01afc29362172f355685 SHA-256: 5e9e86f8a1808c56907bda93e70a0b42937eb5d8c2c137ad3ebfb7359d651f74
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by 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 1.0000

Heuristics 5

  • 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://trafficel.ru/strik?keyword=head+of+roman+patrician+ap+art+history PDF link annotation
    • https://posilopawirina.weebly.com/uploads/1/3/4/3/134353572/jemiresega-sexetefe.pdfIn PDF document text
    • https://xalipifizipig.weebly.com/uploads/1/3/1/3/131379045/rezasokeri_vilatutamonobar_dogosurikenime.pdfIn PDF document text
    • https://lekekupoj.weebly.com/uploads/1/3/4/5/134513515/9131406.pdfIn PDF document text
    • https://rofexigu.weebly.com/uploads/1/3/0/7/130738805/mazogesunu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370764/normal_5f924263db985.pdfIn PDF document text
    • https://bizumoku.weebly.com/uploads/1/3/2/6/132681494/darefekaku.pdfIn PDF document text
    • https://lewubudakaxawo.weebly.com/uploads/1/3/4/3/134342842/ef5a2f6f939034f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450340/normal_5fa1ea098ffde.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/jiwisi/candyland_board_game_instructions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/266202a3-fc20-4574-ba4e-f5d396973b72/zilaga.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/550596e5-8251-4308-82d9-d93d731b6e6e/mimututuzimozupavuxako.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_off00005517.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5517 5428 bytes
SHA-256: a313038fda0c3b2d248974942ee14fea0f0af13c6dbbcc288307d663336c124c
font_01_sfnt_off0000676b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x676B 10276 bytes
SHA-256: 8855d859d66465a054b84f0afc3ea7e7f21e421f5b0b620de41d3ee0d38273c7

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