Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bd09558ef71b26d…

MALICIOUS

PDF

91.8 KB Created: 2020-11-25 01:25:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 03b053485a464e90adc5a1a699e4d274 SHA-1: 65094e501537a60c6475c29f353bd81fd87b3ce5 SHA-256: 9bd09558ef71b26d00ea3a33bf91b1cf69454e94c259ef6a3def197b2ff83bb3
96 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains an embedded URI pointing to 'traffset.ru', which is likely the initial landing page for a phishing attempt. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool often used to create PDFs from web content, further supporting the phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://traffset.ru/strik?utm_term=can+a+square+fit+in+a+rectangle
    • https://cdn-cms.f-static.net/uploads/4377935/normal_5f8cb61b7d325.pdf
    • https://cdn-cms.f-static.net/uploads/4376850/normal_5f92108e24a50.pdf
    • https://cdn-cms.f-static.net/uploads/4459483/normal_5fbd8ba72d79d.pdf
    • https://cdn-cms.f-static.net/uploads/4402488/normal_5fa3c23c20b55.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/fbb46ad5-894b-4563-94fa-de1ac820f867/palonilurokelabusiluf.pdf
    • https://s3.amazonaws.com/zurovajij/toxujifilunuse.pdf
    • https://uploads.strikinglycdn.com/files/b472f417-b296-425b-b8d5-36d0dbad3392/zoxulorelulakafido.pdf
    • https://s3.amazonaws.com/lodazojamuva/case_clicker_gui_v3rm.pdf
    • https://uploads.strikinglycdn.com/files/e92326b1-f8a4-4d3d-99b6-c26860aadd91/zijagi.pdf
    • https://s3.amazonaws.com/wulotugadag/game_game_car_wala.pdf
    • https://s3.amazonaws.com/betefowubevat/1845556753.pdf
    • https://uploads.strikinglycdn.com/files/ede3a6ad-d606-40d6-996e-3ef10951cb51/wanisubilofomonu.pdf
    • https://uploads.strikinglycdn.com/files/0ec74670-49fc-4bdc-a439-4ad73331372f/7241668657.pdf
    • https://uploads.strikinglycdn.com/files/8b7d638c-6702-4129-b0df-9d998ee80056/dofokupadixonumeni.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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License
    • https://savannah.gnu.org/projects/freefont/
    • http://www.gnu.org/licenses/
    • http://www.gnu.org/copyleft/gpl.html
    • http://scripts.sil.org/OFL

Extracted artifacts 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off000129d7.bin
45ea5af43ca9b83617cd73b982c0b687b0e0ec6a22a7ddf263ebf067db25cf0d		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x129D7 23448 bytes
font_00_sfnt_off0000d694.bin
048fb1891f432488516cd811e7b04d68e7d39e548ca3495625137f8fb0c23ff4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD694 6744 bytes
font_01_sfnt_off0000e779.bin
baa145cda63df7c0eabe30b238249f981e98e5cf1a325996bd7cfd9eec52e826		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE779 4972 bytes
font_02_sfnt_off0000f868.bin
d5012b4ec8d1a30fc8184c578587f12faba8dfcc00cf5ee7dcf3d2b21dc32b15		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF868 1732 bytes
font_03_sfnt_off000100fe.bin
2d40d51a179490c487ab16fc770ffe5c68cd66891e9e9874aa001d7c39713a1d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x100FE 11872 bytes
font_05_sfnt_off000152c5.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0x152C5 4324 bytes

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