Malicious PDF — malware analysis report

Static analysis result for SHA-256 d992c2a3f1db86c0…

MALICIOUS

PDF

77.4 KB Created: 2021-03-08 21:45:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 7a3e12c1f0889fb545f067260e3f7de5 SHA-1: 8ad4b61b3b85000a1382b1e04930414a24e025d8 SHA-256: d992c2a3f1db86c07656af34d698af60a35480621269780e0f7e069c0bf8c0d0
126 Risk Score

Malware Insights

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

The sample is identified as malicious by ML classifiers and ClamAV, with a specific detection name indicating phishing and trojan characteristics. It contains numerous embedded URLs, with one prominent URL pointing to 'baarspo.ru', suggesting a phishing or malware distribution attempt. The PDF structure and embedded content, despite being heavily obfuscated, are consistent with malicious documents designed to redirect users to external, potentially harmful, sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://baarspo.ru/strik?utm_term=how+to+say+steak+tartare PDF link annotation
    • https://cdn.sqhk.co/devepogisog/foYgizP/72246379163.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497082/normal_60418186c1bf5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453730/normal_5ff4127bc3476.pdfIn PDF document text
    • http://sarkife.site/dofezuvikatudotanefw7r.pdfIn PDF document text
    • https://cdn.sqhk.co/wigalefu/fihjbgi/giwawivuno.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490930/normal_600934c298a4c.pdfIn PDF document text
    • https://cdn.sqhk.co/rezeribevi/CgeghSu/car_in_traffic_2018_mod.pdfIn PDF document text
    • https://cdn.sqhk.co/vegubefeno/jgvIR6O/52624309407.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421336/normal_600b8da410b07.pdfIn PDF document text
    • https://cdn.sqhk.co/tivuzofep/jiCgjhu/21562878661.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406787/normal_600f58b977604.pdfIn PDF document text
    • http://usesol.xyz/lolupatuu8ka6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382778/normal_604675bc2f982.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453333/normal_60342251b5814.pdfIn PDF document text
    • http://dafusunefu.iblogger.org/wajik.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pifazudiso.rf.gd/44473166687.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e89d7896-d673-47d2-91d7-69119c24f87c/kezebaledamuvebe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f62bed30-aa2a-4c60-a6bd-ef21d18a269a/mezelixijenokix.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/be81a53c-9b59-4d54-a034-45b4162a5a7e/gojedimafesojozij.pdfIn PDF document text
    • http://zopegekole.rf.gd/grade_2_comprehension_worksheets_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0dc970b8-b3e2-478b-85a3-414759340158/what_caused_the_agricultural_revolution_in_britain.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_off0000f16f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF16F 4868 bytes
SHA-256: 7a77dc4a3122a077b4358322af9df900ff83ae802c3d373083ee823defd76bdf
font_01_sfnt_off0001021e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1021E 11300 bytes
SHA-256: 015666a4d69198c44ec68f8edc90118e3eb310c69c9b2ed31ba92a07c2ed15f1

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