Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b31dd749108be45…

MALICIOUS

PDF

84.0 KB Created: 2021-02-20 09:54:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4ae6be249618e9c3548eba473f70bfde SHA-1: 73eeb358a02565a026e6ed366f6e1a881fc9368d SHA-256: 9b31dd749108be459bacfa47789dd2bf763d7e88b6e6cf13700111bfb1d84e0c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, identified as a link farm, which is a common tactic for phishing or distributing further malicious content. ClamAV and ML classifiers also flagged this file as malicious, specifically as a phishing trojan. The presence of numerous external URLs suggests an attempt to redirect the user to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://jacksth.ru/strik?utm_term=bosch+silence+plus+44+dba+e24
    • https://static.s123-cdn-static.com/uploads/4487632/normal_5ff89e7433c4d.pdf
    • https://static.s123-cdn-static.com/uploads/4472198/normal_5fee3178a9b3d.pdf
    • http://sehq.xyz/fannie_mae_jumbo_loan_guidelinesgvsft.pdf
    • http://help-violation.com/retroarch_steam_link_streamryji0.pdf
    • https://gedibixofesona.weebly.com/uploads/1/3/4/6/134688069/75dff.pdf
    • https://cdn.sqhk.co/nifodotiriru/wdgeTjb/85549730568.pdf
    • https://cdn.sqhk.co/pigajifaw/jgNesja/26654439233.pdf
    • https://static.s123-cdn-static.com/uploads/4454421/normal_5ffde3c41ecd0.pdf
    • https://cdn.sqhk.co/vozeseseber/9Qhawif/blood_pressure_readings_explained.pdf
    • https://static.s123-cdn-static.com/uploads/4493195/normal_6009534be80b8.pdf
    • https://kopomitesukov.weebly.com/uploads/1/3/1/4/131453216/bareradumewux.pdf
    • https://cdn.sqhk.co/tuminageka/jghRHih/nixotagajidiloxalele.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/pujirageg/7816264745.pdf
    • https://s3.amazonaws.com/somamere/letedinem.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e733.bin
528dda3effedbd20a96167a4f6b87743a9cff724e8f63c9c7aa6ed2ba4b34432		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE733 5276 bytes
font_01_sfnt_off0000f909.bin
054e771e88bd913eeec32a53ab20121c78beb79c2cc90577686008076789a35a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF909 11120 bytes
font_02_sfnt_off00011f6f.bin
975089639afea594160f6daa1ae948ffc4125994d61a9fd32dce02580f7b6b15		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11F6F 16312 bytes
font_03_sfnt_off000134fa.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0x134FA 4324 bytes

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