Malicious PDF — malware analysis report

Static analysis result for SHA-256 77e85487d3ab684e…

MALICIOUS

PDF

73.7 KB Created: 2021-04-02 15:35:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 82ebcd7540d9ff5c3626f6abaad2764d SHA-1: c9eecaa23cd267735f7bca3fcdf1989cc49b1d87 SHA-256: 77e85487d3ab684e5d907bbddb62371fb626b98ce8650dbc5e1452d0fd905735
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, and is flagged by ClamAV as a phishing trojan. The document body, though heavily obfuscated, suggests a lure related to 'technical drawing lessons'. The presence of numerous external URLs indicates an attempt to redirect the user to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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://gimoguvi.ru/award?keyword=technical+drawing+lessons+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4448535/normal_6034cba6896eb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467004/normal_60514371b70a8.pdfIn PDF document text
    • https://cdn.sqhk.co/vabalogu/h6gjohi/bloons_tower_defense_3_moab_strategy.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365594/normal_602e99b209a0e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418199/normal_6002de799745b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405930/normal_5fe8fb560f1cd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486201/normal_6055162269db2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386330/normal_6042e66cb5b8e.pdfIn PDF document text
    • https://cdn.sqhk.co/suxevevagova/gigfjf0/22443225585.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461207/normal_5fd8fdf5143b8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470040/normal_5ff84882a1391.pdfIn PDF document text
    • https://cdn.sqhk.co/vopiruwikil/5mhah85/best_cross_stitch_patterns_for_beginners.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417658/normal_6044f4b3acf8c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413238/normal_604654415a57e.pdfIn PDF document text
    • https://cdn.sqhk.co/vefoveted/rLij6jj/5370787026.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374364/normal_604172cdcddeb.pdfIn PDF document text
    • https://cdn.sqhk.co/lewivapawo/dOpMhjd/ascension_sky_dragon_tips.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://99470c7d-c692-4648-a7b8-36ea19db2883.filesusr.com/ugd/ab059d_3eece4d04f374abeba348920f8bfecd1.pdf?index=trueIn PDF document text
    • https://0dd4521b-3e41-4083-9bcc-807cce03ae78.filesusr.com/ugd/cfe2e9_90548876a49c414cbf30869ea843e238.pdf?index=trueIn PDF document text
    • https://b7af6bb9-01eb-4839-ab56-764651de4344.filesusr.com/ugd/2486b5_55b627b35b854945a0a7d04babf8a505.pdf?index=trueIn 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_off0000e2da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2DA 5456 bytes
SHA-256: a4a6cb35dfa1fa1f913d18325d19e5c940d33b16727009ee53675d71cc10df94
font_01_sfnt_off0000f579.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF579 10796 bytes
SHA-256: b12c85cac2e97758c3947960a56bfa3f1ac7477589bed146d0711258960977c8

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