Malicious PDF — malware analysis report

Static analysis result for SHA-256 36a85cec860415b0…

MALICIOUS

PDF

72.1 KB Created: 2020-12-20 15:42:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 553d904cede7931120a996c4f6fa157b SHA-1: 925adf4368ce7c1b26fa28d0bb9d7c857d199921 SHA-256: 36a85cec860415b07a303da144c1a5bffdc970b6ab77f5bd4d3844bde3a6429f
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm. The document body, though heavily obfuscated, suggests a lure related to 'bronze anniversary gifts for him'. The presence of numerous external URIs and the ML classifier's high confidence score strongly suggest malicious intent, likely for phishing or distributing further malware via the linked content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://traffnew.ru/strik?utm_term=bronze+anniversary+gifts+for+him PDF link annotation
    • https://lixotesit.weebly.com/uploads/1/3/4/6/134655402/vugatewulex_xirexutuzo.pdfIn PDF document text
    • https://semukozev.weebly.com/uploads/1/3/4/4/134493414/dujamiwi-bepasusuligofex-tagemewewevo.pdfIn PDF document text
    • https://jotogenawe.weebly.com/uploads/1/3/1/4/131406354/gulisume_zotowusafadigu_barexujebepo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425217/normal_5fba8a79e0f48.pdfIn PDF document text
    • https://vivazezege.weebly.com/uploads/1/3/4/0/134041722/2050314.pdfIn PDF document text
    • https://xalitizamer.weebly.com/uploads/1/3/4/8/134863297/guzewukusu.pdfIn PDF document text
    • https://zorivaleguzovul.weebly.com/uploads/1/3/4/5/134596353/puzarizukego_futavoxanusi.pdfIn PDF document text
    • https://kobipisi.weebly.com/uploads/1/3/4/3/134312725/3711138.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453560/normal_5fc873adc5edc.pdfIn PDF document text
    • https://bonivodetago.weebly.com/uploads/1/3/4/5/134517527/6402881.pdfIn PDF document text
    • https://jafumatelitu.weebly.com/uploads/1/3/4/8/134884178/5957964.pdfIn PDF document text
    • https://dimeropudefopo.weebly.com/uploads/1/3/4/7/134742885/rugilixi.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/kifutizijebuj/echocardiography_guidelines_for_valve_and_chamber_quantification.pdfIn PDF document text
    • https://s3.amazonaws.com/lebaxa/everton_wolves_match_report.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_off0000dd0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD0A 5412 bytes
SHA-256: 2328a3a085726d5d23d07fd5111eb10a869cde3e7bf5388ee1232fe1bcfef506
font_01_sfnt_off0000ef67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF67 10676 bytes
SHA-256: 457626cf897cab4c0ae9595a45cdf1d3eed45b25d1c32f8f1e094cb619ad972e

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