Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b345e320b549b30…

MALICIOUS

PDF

82.5 KB Created: 2021-06-13 06:10:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 9df417fa840042c837e3a3d70b5f9048 SHA-1: 46ce404b369ca167d094ca91cbddbc5336d050dd SHA-256: 9b345e320b549b3052655299994b67a4ed26c7f17d12624b6bc66a85a981b9d5
186 Risk Score

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 0.9995

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://garglob.ru/pbw?utm_term=best+minecraft+bedrock+edition+servers PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4415304/normal_5fc8b60d1a8b5.pdfIn PDF document text
    • https://puzemebakojufem.weebly.com/uploads/1/3/4/2/134234574/a4a8132ab5.pdfIn PDF document text
    • https://bexizenibumux.weebly.com/uploads/1/3/4/4/134481127/07516da4b256.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485016/normal_6030784f976d7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371497/normal_5fe823569a8ff.pdfIn PDF document text
    • https://wagidojinubem.weebly.com/uploads/1/3/1/4/131438567/9154586.pdfIn PDF document text
    • https://bekobivovovezu.weebly.com/uploads/1/3/4/6/134608345/ecc6fc11.pdfIn PDF document text
    • https://radumudoxelis.weebly.com/uploads/1/3/4/2/134235428/1762873.pdfIn PDF document text
    • https://xifamileg.weebly.com/uploads/1/3/4/6/134687686/xagiman_vafupomaxo.pdfIn PDF document text
    • https://judenebubiz.weebly.com/uploads/1/3/4/6/134656374/wujafun_labetener.pdfIn PDF document text
    • https://xewixubigikuj.weebly.com/uploads/1/3/4/8/134892453/jajivir.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444875/normal_60c2a52d509b9.pdfIn PDF document text
    • https://fezagexagowib.weebly.com/uploads/1/3/5/3/135313062/6813168.pdfIn PDF document text
    • https://vedabigejiko.weebly.com/uploads/1/3/1/4/131438046/nimanuwexu.pdfIn PDF document text
    • https://zojufagilazit.weebly.com/uploads/1/3/0/9/130969654/d940ca61.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4455374/normal_60b01caf3a97e.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/1760a400-f9c8-4454-8227-55d94c84b4c3/fituxozeg.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c68267d-865e-4c25-9868-a94a50bc95fb/25566734618.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/05c38374-aab9-46f4-8d9e-becbf7755a01/english_grammar_workbook_grade_4.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a891c3a9-9fd4-4b28-9fae-0fc6d6f7d31f/gugob.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bae12170-2e56-460b-8285-2562bb0fe367/gurulakuvabujelupakami.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f6eb6cb4-4c1c-424e-852e-2bc674c12b56/when_was_hp_elitebook_8460p_released.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC00 5448 bytes
SHA-256: 4e911afb451190c28ea0115ae31c98472b78f7e339f19916625ef9272aba9477
font_01_sfnt_off0000fe7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE7D 12820 bytes
SHA-256: aa103980368e088a21ec6398cbde5cbb33a8b914daaeedc5878e9349717e473b
font_02_sfnt_off000126d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126D7 16192 bytes
SHA-256: f5d7cc85b159eff322691f77e293c87aff7e05714f2eeb4a05825108c12f9092