Malicious PDF — malware analysis report

Static analysis result for SHA-256 943d87c0fd907a01…

MALICIOUS

PDF

66.1 KB Created: 2021-02-18 17:37:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 5f5b50ffdc96ab2a2c77d63d6aa77c52 SHA-1: a33c91435ad92548d1565eeec989f0df13eb9997 SHA-256: 943d87c0fd907a011071bea8ef3924646d152c5b510fc19f998e5912143ebb4f
96 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URI pointing to a suspicious domain, likely intended to redirect the user to a malicious site. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and a date, suggesting it might be a generated document used as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://seumenha.ru/wix?keyword=stickman+madness+2 PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4426830/normal_5fcd6be2abb08.pdfIn PDF document text
    • https://cdn.sqhk.co/vasozaponem/ghngdtE/othello_act_2_summary_short.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456393/normal_602953b5c30fb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378383/normal_6008dc39bc0b0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416153/normal_602b487935835.pdfIn PDF document text
    • http://gavewedek.iblogger.org/79880283028.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/bajuse/prfungstraining_goethe-_zertifikat_a2_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/jusuberu/sezowidej.pdfIn PDF document text
    • https://s3.amazonaws.com/zunaporam/93133230496.pdfIn PDF document text
    • https://s3.amazonaws.com/juliziwojatige/viwotedow.pdfIn PDF document text
    • https://s3.amazonaws.com/sowewazulejewi/miracle_crack_2._58_setup.pdfIn PDF document text
    • https://s3.amazonaws.com/levovod/skateboard_sizes_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/dozore/bangla_bhoot_fm_high_quality.pdfIn PDF document text
    • https://s3.amazonaws.com/bupijila/zukagipefesokegotumuk.pdfIn PDF document text
    • https://s3.amazonaws.com/kugelilizibuwum/xegixenugopepuru.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_off0000c692.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC692 5256 bytes
SHA-256: 9f3f8cb8a36eaba1d75c6ad6f013ae65a12902cbbf613e1292aecc8487b3e51d
font_01_sfnt_off0000d867.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD867 10208 bytes
SHA-256: a5a8e1891bfcd94eec577824dc16032ce244ebbd5c331c7e38fbc80a19a7c03d

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