Malicious PDF — malware analysis report

Static analysis result for SHA-256 52f573d9acccf6ab…

MALICIOUS

PDF

69.2 KB Created: 2020-12-05 08:40:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: f75a59c061b386390c9932c66856fd43 SHA-1: 7915d270b2bec689c27f2c3d0196ad9b53f3bc45 SHA-256: 52f573d9acccf6abc8d09dc199c4837bf13ea72237f0a380ee1ebc6a0871accb
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a common tactic for link farms and phishing sites, with one prominent URL being traffset.ru. The ClamAV detection and ML classifier strongly indicate maliciousness, specifically flagging it as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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.
  • 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/strik?utm_term=mta+police+exam+study+guide PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4413125/normal_5fc9c6c18a27f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417226/normal_5fb537dae65cb.pdfIn PDF document text
    • https://buliduxefexefux.weebly.com/uploads/1/3/1/6/131636978/dd8f8769.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380680/normal_5f914091212a8.pdfIn PDF document text
    • https://molisemopum.weebly.com/uploads/1/3/1/4/131437834/c8d8ab5f.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/jamokaroxoj/aplasia_medular_post_quimioterapia.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a4cba779-847e-4a17-b828-8975228a7df6/jomivaze.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8c581b5e-f62a-4fbf-a860-389324eeb430/zaxavataf.pdfIn PDF document text
    • https://s3.amazonaws.com/petubapizo/basigetowegizafet.pdfIn PDF document text
    • https://s3.amazonaws.com/bulikowexunepov/nutrition_value_of_beef_tendon.pdfIn PDF document text
    • https://s3.amazonaws.com/xapota/ipcc_assessment_report_2013.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eea141e5-78b3-4042-acdf-58418aeeb557/josegav.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dc36556a-af9d-4308-994a-609ac9993b48/62235768784.pdfIn PDF document text
    • https://s3.amazonaws.com/babetafaperaxov/texas_high_school_rodeo_association_region_6.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_off0000d08a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD08A 5472 bytes
SHA-256: f361ecba3ba0efe400c1092b79652f0d25ccca33c5a5c9fed29f3d13546b1604
font_01_sfnt_off0000e33a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE33A 10832 bytes
SHA-256: e2627ffc27b274872e6e1b28c18b676bad965155a8c5e561544bd619df0875af

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