Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b0100798490000c…

MALICIOUS

PDF

65.8 KB Created: 2021-01-11 07:41:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: af776ddfa810b70a0eb5b5117d54a040 SHA-1: 975cced3dcad489a7719a90c72e12f7ba42b765f SHA-256: 6b0100798490000c7fbfe1548061fe4cf40fe6aadf05dbc3dc33a39ae3aee9c6
96 Risk Score

Malware Insights

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

The PDF contains an embedded URL that points to a suspicious domain, identified by heuristics as an external URI and flagged by ClamAV as a phishing trojan. The ML classifier also strongly indicated maliciousness. While no scripts were directly extracted, the presence of an external URL and the nature of the ClamAV detection suggest the document is designed to redirect the user to a malicious site, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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://trafffe.ru/aws?utm_term=trigonometric+identities+1+practice+problems+answers PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4404738/normal_5fb2a12570b2d.pdfIn PDF document text
    • https://cdn.sqhk.co/buxotulato/mRgXFij/gitewi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387919/normal_5ff50ae1cd860.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402261/normal_5f97e57b6d353.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404313/normal_5f98eb852ee18.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448103/normal_5f9efbdf6ded8.pdfIn PDF document text
    • https://cdn.sqhk.co/molofagaji/bgfRDcy/69194819406.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475992/normal_5fc63c02ae1e1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413108/normal_5f9c4ef2d2c96.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/labitajaxatufib/quotes_sustainability_reporting.pdfIn PDF document text
    • https://s3.amazonaws.com/fapaga/hard_multiplication_worksheets_4th_grade.pdfIn PDF document text
    • https://s3.amazonaws.com/ligole/cool_daddy_fryer_reviews.pdfIn PDF document text
    • https://s3.amazonaws.com/mejados/lactase_enzyme_lab.pdfIn PDF document text
    • https://s3.amazonaws.com/lekelepowo/kalimezelapiroxaro.pdfIn PDF document text
    • https://s3.amazonaws.com/lerezazo/38887831397.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_off0000bf3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF3A 5628 bytes
SHA-256: 3b5ebf8f40c17580394dd90b020e05a7c859215dfbbed8e34b690ccf0b9f3dff
font_01_sfnt_off0000d257.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD257 11612 bytes
SHA-256: e3792ca1fcbed958578cc618733379ac024dbbcda4c3f6330b77d55a22adba75

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