Malicious PDF — malware analysis report

Static analysis result for SHA-256 b744d2509056de3e…

MALICIOUS

PDF

72.3 KB Created: 2021-01-18 21:32:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 5b36ef3d8985bbcf96aa0f5d4f079b4b SHA-1: 858f45223f9600f76a4b836f7f1b3ac9a1b7b8c1 SHA-256: b744d2509056de3ee0c581ef433b9e28a77c14e5144a32abfc74e2c3be1bcab8
96 Risk Score

Malware Insights

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

The PDF file contains a heuristic firing for an external URI pointing to 'trafffi.ru', which is flagged as malicious. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, contains text related to 'fishing boat kit' and 'wkhtmltopdf', suggesting a lure to a malicious website.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://trafffi.ru/123?utm_term=rc+fishing+boat+kit PDF link annotation
    • https://cdn.sqhk.co/dijogiper/JGWjdhd/falunenizamixi.pdfIn PDF document text
    • https://cdn.sqhk.co/kibizatududo/ffVgihj/flights_to_las_vegas_from_houston.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450151/normal_5fa4b7cf72332.pdfIn PDF document text
    • https://cdn.sqhk.co/jefapukawore/hiiihpw/ramp_car_jumping_level_12.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485004/normal_5ff58581ab7ac.pdfIn PDF document text
    • https://cdn.sqhk.co/fedovusig/QhbLhb0/skater_girl_aesthetic_outfits.pdfIn PDF document text
    • https://cdn.sqhk.co/titubebojek/eK6lggu/slingshot_balloon_launcher.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/pivetuzadujo/54835241363.pdfIn PDF document text
    • https://s3.amazonaws.com/kosamupim/tenumakideraxi.pdfIn PDF document text
    • https://s3.amazonaws.com/xidazeze/candy_crush_saga_life_hack_android.pdfIn PDF document text
    • https://s3.amazonaws.com/gezejoputiwinu/fijoguwopunaxaz.pdfIn PDF document text
    • https://s3.amazonaws.com/xokebore/17349069489.pdfIn PDF document text
    • https://s3.amazonaws.com/wazagidonux/fawofibekuvuxofiti.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d234.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD234 4896 bytes
SHA-256: 88a02c5db08692b752ba346cc33b884b0ce30aa44702ac9143534ed924efcae2
font_01_sfnt_off0000e2cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2CC 10428 bytes
SHA-256: 21ec625ad7e54ba9fee6128810ac7ea8ff6ecfc356e5372a7f6edbdc6a0e1072
font_02_sfnt_off0001064d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1064D 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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