Malicious PDF — malware analysis report

Static analysis result for SHA-256 d795af18debccd78…

MALICIOUS

PDF

65.6 KB Created: 2020-12-16 18:05:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 9b6bcef6b486c5d64d16ae80641302d5 SHA-1: 1327475d5a9489797721da4232d61ab626d976bf SHA-256: d795af18debccd78c2d84bf9d78eb978c9ea479b138234e7aac18e4699c1f114
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by a machine learning classifier and ClamAV, indicating it contains malicious content. The heuristic analysis revealed a significant number of external links, suggesting a link farm or redirection mechanism. The primary malicious URL identified is https://trafffe.ru/strik?utm_term=4000+mb+ka%25C3%25A7+gb, which is likely used to host or redirect to a malicious payload. No scripts were extracted, but the presence of numerous external links points towards a phishing or content-luring attack vector.

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://trafffe.ru/strik?utm_term=4000+mb+ka%25C3%25A7+gb PDF link annotation
    • https://lukumupanulafaz.weebly.com/uploads/1/3/4/6/134683212/be2dbb.pdfIn PDF document text
    • https://bopugokux.weebly.com/uploads/1/3/4/9/134901566/pugedaxibas_wugogomofogal_tuxuvowu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425738/normal_5fb8013a8b0d1.pdfIn PDF document text
    • https://nosovaranipad.weebly.com/uploads/1/3/4/7/134743093/geganeloropivi-xoriramudesi-jemeterolofad-wakopin.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/2326df7a-2210-44c4-a25b-0ec176683963/vapisu.pdfIn PDF document text
    • https://s3.amazonaws.com/bejideba/zugoleguwovovi.pdfIn PDF document text
    • https://s3.amazonaws.com/gofilafixu/acura_ilx_2015_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/81d6a63d-d98b-4351-a98a-2bef126a6fd7/planet_earth_from_pole_to_pole_worksheet_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/ligole/vietnam_information_technology_report_2017.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/75e2ff28-340e-493d-9ce9-7c5489cbbb41/sesenelixutefegipef.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c9eb6ced-34e2-46dd-a92e-081756ab745a/30904034618.pdfIn PDF document text
    • https://s3.amazonaws.com/jazofi/bowupemedunawasarologal.pdfIn PDF document text
    • https://s3.amazonaws.com/zafaronivaj/newlands_reclamation_act_of_1912.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_off0000c13d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC13D 5220 bytes
SHA-256: b68c66fe9d43c63bf39e9daa89fa8fa08d39c690cc6a02a74d7818584224d29d
font_01_sfnt_off0000d2f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2F7 11716 bytes
SHA-256: 190aebee99339d29380fc1266c011c0c1153da80bafcb41c55d873da44c56b9c

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