Malicious PDF — malware analysis report

Static analysis result for SHA-256 dff4f0d5d398f799…

MALICIOUS

PDF

69.5 KB Created: 2021-02-22 20:17:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 388b3632fe51f5f79d29b9ce76d2e71b SHA-1: cb7d4a90e9c19fa2c370955da26f604ad1143303 SHA-256: dff4f0d5d398f79998816abc8366eb07dd0e46fc348183c774b97afa7b2a5a2f
96 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, one of which is directly referenced in the heuristic analysis as an external URI. The document body, though heavily obfuscated, suggests a lure related to a book title to entice users to click the embedded link. No scripts were extracted, but the presence of malicious URLs indicates an attempt to redirect users to a compromised site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://seumenha.ru/wix?keyword=blood+music+greg+bear+pdf PDF link annotation
    • http://usejus.pro/mefulxcxax.pdfIn PDF document text
    • https://cdn.sqhk.co/tajaketo/x9vjhjc/overdrive_ninja_shadow_revenge_mod_apk.pdfIn PDF document text
    • http://mebosopevux.iblogger.org/wonder_novel_text.pdfIn PDF document text
    • https://gemuxobupi.weebly.com/uploads/1/3/2/6/132682013/5958644.pdfIn PDF document text
    • https://cdn.sqhk.co/janezewufaj/hdHKgi4/kebidijozidilejuloj.pdfIn PDF document text
    • https://cdn.sqhk.co/kewixoretuze/iaYhjc2/gujufusimerexe.pdfIn PDF document text
    • http://save50it.info/gumekixufiropuxekumeg611t.pdfIn PDF document text
    • https://lusenivusimutom.weebly.com/uploads/1/3/4/8/134887898/7f6d91.pdfIn PDF document text
    • http://cheatyou.site/tasuvagugixaziril7iikc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000d2d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2D4 5664 bytes
SHA-256: 296098da2b7db219d85c445dfcce7ce79644934f2c76df3e5f33f028b540ed31
font_01_sfnt_off0000e607.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE607 10292 bytes
SHA-256: ac3957130ddb793aaea37acecce66973565c91eeb74d4bd78f3cbb3b4d62e2c8

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