Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7605bb1feaef992…

MALICIOUS

PDF

69.5 KB Created: 2020-11-18 10:23:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 4e600dd2f4287c967b503711bb504305 SHA-1: d21a1cf04047087baf947bfd7bb858b318fd22b1 SHA-256: b7605bb1feaef9926819b3659899579eca9b810044d9203e680ed41ef832adfb
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://trafftec.ru/strik?utm_term=sunset+limited+book PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4417534/normal_5f9a274aeeca6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367279/normal_5f97c6781f3f4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366395/normal_5f8d387cc2acc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408004/normal_5faed1ae55da7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412773/normal_5f93d96f8fbbd.pdfIn PDF document text
    • https://woxukobu.weebly.com/uploads/1/3/4/3/134392577/c554f7.pdfIn PDF document text
    • https://lepatoketi.weebly.com/uploads/1/3/4/7/134732542/togefakiza.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408321/normal_5f9fac97eb376.pdfIn PDF document text
    • https://fategebedabeno.weebly.com/uploads/1/3/4/7/134718848/bcb576e4.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/lovetijif/android_whatsapp_backup_to_icloud.pdfIn PDF document text
    • https://s3.amazonaws.com/zosevid/plas_medical_terminology.pdfIn PDF document text
    • https://s3.amazonaws.com/polexebuj/83711173117.pdfIn PDF document text
    • https://s3.amazonaws.com/fukezavazuj/design_code_download.pdfIn PDF document text
    • https://s3.amazonaws.com/bifamomove/sons_of_wichita.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_off0000d18f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD18F 4972 bytes
SHA-256: 97142199adc1c1de9d70a606c87e25f6271e51d7cd6c403daa144e9b577e1974
font_01_sfnt_off0000e269.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE269 11532 bytes
SHA-256: 806a954b5b84fa9e609ed1a3a53f78805ab5a872fa8b2ebf6220bf988437c222

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