Malicious PDF — malware analysis report

Static analysis result for SHA-256 efed655dad7bf017…

MALICIOUS

PDF

66.3 KB Created: 2020-12-15 22:33:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: e4f8d319bd582650dc55bd3ea11f93c8 SHA-1: 5aaeac63ecbb283b95a6148378d32f9d267291a5 SHA-256: efed655dad7bf01714b85a0e64bdc04f7467d569fee27239c8597e589bd1336a
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, a common tactic for link farms or phishing campaigns. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as a phishing trojan. The presence of embedded URLs, including one pointing to 'trafffi.ru', suggests the document is designed to redirect users to potentially malicious websites.

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://trafffi.ru/123?utm_term=inferences+worksheet+6+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4463559/normal_5fd8850cc8073.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404116/normal_5f9fb5ca62752.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445557/normal_5fc86d3fafec6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380083/normal_5f8d3cee0f754.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405651/normal_5f979e2c44044.pdfIn PDF document text
    • https://mudagetani.weebly.com/uploads/1/3/4/3/134381332/1565308.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457561/normal_5fc6f3227d3bc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473044/normal_5fbc81edc2fd3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470038/normal_5fcb53e75eb72.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/fosalizuzu/autocad_3d_modeling_exercises.pdfIn PDF document text
    • https://s3.amazonaws.com/pozokimepe/applied_science_diploma_1st_sem_book.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc332fed26ff1194f82bd0c/t/5fcfa6f9caa95a391e76ea40/1607444218150/crash_team_racing_pc_emulator.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_off0000c881.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC881 5248 bytes
SHA-256: 9375cc21a4b48ca6df8e40f0c065e71fae29503cf01c7555806898b725e0417b
font_01_sfnt_off0000da75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA75 10020 bytes
SHA-256: a44adfc35f519c4a7d4e4a39240aecc76eb2906e0c588ab94440980d34bb293e

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