Malicious PDF — malware analysis report

Static analysis result for SHA-256 d53286e0eb2495e6…

MALICIOUS

PDF

86.1 KB Created: 2021-02-13 12:37:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1ce359969befa06351236208658c9b21 SHA-1: 2c223a5a131f44fe649dfc1097499b8f927f1d73 SHA-256: d53286e0eb2495e6eae991c0e966ae989390ca1610e1f8296ae9ac80122bffc4
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to other PDFs, suggesting a link farm or redirection mechanism for malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic point towards a phishing or malware distribution campaign.

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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://leonvi.ru/wix?keyword=dag+rex+solo+guide+osrs
    • https://cdn.sqhk.co/tunuzasana/iehazag/digital_advertising_marketing_manager.pdf
    • https://bodonovovo.weebly.com/uploads/1/3/1/6/131607174/kinobolor-dizumexofizud-katoxaxexot-laketowamakove.pdf
    • https://cdn.sqhk.co/puzokopu/hge82hq/4388707463.pdf
    • http://grigolia-studio.ru/koxafbqrej.pdf
    • https://cdn-cms.f-static.net/uploads/4453743/normal_600e35f9096c1.pdf
    • https://vabadagijuruka.weebly.com/uploads/1/3/1/8/131856539/zuketekagimar_filixugusatenal_xobunufidamu_nomedaviruku.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/zumezeviwakiz/modewepijutuzuwirek.pdf
    • https://s3.amazonaws.com/rotowan/belanowaletidewuwuxem.pdf
    • https://s3.amazonaws.com/napejaxosinages/standardized_test_practice_answers_algebra_1.pdf
    • https://s3.amazonaws.com/tevigotu/67559477117.pdf
    • https://s3.amazonaws.com/remuv/zelda_majora_s_mask_strategy_guide.pdf
    • https://s3.amazonaws.com/lezerawe/knowledge_questions_and_answers.pdf
    • https://s3.amazonaws.com/nolarifaforuxop/64537171889.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fca2.bin
d4e599229039c4c26ae2433057dafbc66a77af4c95d1d930de02cf5d6edf8b2d
pdf-font-stream PDF embedded font (sfnt) at offset 0xFCA2 4756 bytes
font_01_sfnt_off00010cdd.bin
ea5eed8ce31bfa997e9bfb70750436451bd5baec9e460391061e198307cfb08f
pdf-font-stream PDF embedded font (sfnt) at offset 0x10CDD 15536 bytes
font_02_sfnt_off00013cfa.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34
pdf-font-stream PDF embedded font (sfnt) at offset 0x13CFA 4324 bytes