Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b890574ef13e746…

MALICIOUS

PDF

67.4 KB Created: 2020-11-21 04:38:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 95223b7fe541d7a8e3129640d4775d6b SHA-1: ca9883ee66725ac327245a5964719b8639a7f77c SHA-256: 9b890574ef13e7465c262e84fd16345adcb1e5601b96195d0dde422e9bfcdbcb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous external links, with one pointing to 'traffset.ru', suggesting it's part of a link farm or phishing campaign. The presence of embedded URLs and the 'PDF_SEO_LINK_FARM' heuristic indicate the document's primary purpose is to redirect users to external, potentially malicious, sites.

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/123?utm_term=us+cellular+online+album PDF link annotation
    • https://wajifisawebe.weebly.com/uploads/1/3/4/4/134480175/5b1011.pdfIn PDF document text
    • https://tenimevu.weebly.com/uploads/1/3/4/3/134315692/4396192.pdfIn PDF document text
    • https://polatubogo.weebly.com/uploads/1/3/4/5/134598163/falajitoxov_jilolosoje_dokobogikiwedek.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487625/normal_5fb2a458a4613.pdfIn PDF document text
    • https://rinobawafikukew.weebly.com/uploads/1/3/4/5/134583240/dujewev.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/d62469f6-451d-4841-a2b5-3fdaae13dd6e/muvabolezixusosezovi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5e529bd1-90ac-4d93-925d-08734b457d0a/23224034922.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/371a2b79-b20e-4c51-97ab-bab9a443e135/42713758845.pdfIn PDF document text
    • https://s3.amazonaws.com/wilugugo/43320644255.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/80ce45bf-18d3-46ce-9efb-ff22b68c8232/gothic_1_dusty.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e1212754-0e65-47d1-9bc4-b4a3e5aa9cb6/xavizifugurimeme.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fe7335b0-f9e0-4c2d-a1cd-189993a34ad2/31724945628.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1d032707-9dc7-4057-acbc-fe1657d1b9e3/vitifazixexevekulele.pdfIn PDF document text
    • https://s3.amazonaws.com/mafavuzenoliki/tiny_huge_mario_64_rom_hack_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/48d17911-db6e-4544-9017-dba6040a7f35/zepumi.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_off0000cb7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB7A 5076 bytes
SHA-256: 170270dfe35a5f3c70457147acf35182899762f9d325e6d68cfa86282ab45541
font_01_sfnt_off0000dcac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCAC 10696 bytes
SHA-256: 0bc9415524ae74f031db56732d3f19f4c0a85a1e7cca7d727d3dc49850a314d6

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