Malicious PDF — malware analysis report

Static analysis result for SHA-256 913bf5f418fe4458…

MALICIOUS

PDF

69.7 KB Created: 2020-12-11 17:12:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8e0557872f99cf17b5d67abaae75b061 SHA-1: 78c2d9cdca69b6c30a5958400adc0f115fe5065e SHA-256: 913bf5f418fe445887aa2c2aaa7dd94e397edb7c7ccedbfc8430ff1a01b372e9
96 Risk Score

Malware Insights

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

The file is a PDF document identified as malicious by ClamAV and an ML classifier. It contains an embedded URL pointing to 'traffine.ru', which is likely used for phishing or malware distribution. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's not a legitimate document.

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://traffine.ru/strik?utm_term=beery+vmi+manual
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/29c6b29d-6506-4dfe-8a9d-bdae458d11a7/knife_switch_battery_disconnect.pdf
    • https://s3.amazonaws.com/jepavilutabilel/learning_outcomes_ncert.pdf
    • https://uploads.strikinglycdn.com/files/c9eb6ced-34e2-46dd-a92e-081756ab745a/30904034618.pdf
    • https://static1.squarespace.com/static/5fc11b742e34347c70454783/t/5fca24fa55485c3109ba2f73/1607083258442/digerelajejifezexokoze.pdf
    • https://s3.amazonaws.com/fuwawibu/alimentos_alcalinos.pdf
    • https://s3.amazonaws.com/vonusirukete/laundry_soap_sheets_australia.pdf
    • https://s3.amazonaws.com/zonivezada/20112896392.pdf
    • https://s3.amazonaws.com/fazujo/93757288301.pdf
    • https://s3.amazonaws.com/bufipevuril/workplace_first_aid_guide_poster_free.pdf
    • https://s3.amazonaws.com/pirosisob/22032115483.pdf
    • https://s3.amazonaws.com/buganabowumujef/teropetoxez.pdf
    • https://s3.amazonaws.com/xilasisefi/stratolounger_recliner_repair.pdf
    • https://s3.amazonaws.com/pivetuzadujo/58738744938.pdf
    • https://s3.amazonaws.com/bizamesuwepe/far_from_the_madding_crowd_book_author.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d5dc.bin
adb1ac546a5f1fbede008812b7a7db6ac89f64b4b0c63c27cf3318d2ef449a92		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD5DC 4864 bytes
font_01_sfnt_off0000e65a.bin
95356d492cea9dbe9d6cb7617ec478d6e88a5a8a81c72d031a0da368460573f4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE65A 10576 bytes

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