Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ff9344426720805…

MALICIOUS

PDF

94.2 KB Created: 2021-09-13 18:47:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 194fb2c583b0127624ac8213f1c00d59 SHA-1: e983e16dfdac720d3f036790245d13d36a556d21 SHA-256: 7ff93444267208052794f2e32a76b78bbca4cb33fd4ee4e6ee71b03987069088
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many of which point to disposable hosting, indicating a likely attempt to distribute malicious content or conduct phishing. The document body was unreadable, but the heuristic firings strongly suggest a malicious intent related to URL redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://pistant.ru/uplcv?utm_term=enable+auto+import+android+studio
    • http://progfin.pl/userfiles/file/dutaxovekib.pdf
    • http://bangtaisay.com/uploads/userfiles/file/65718400497.pdf
    • http://semut73.com/contents/files/naxuteram.pdf
    • http://novichiha.ru/pic/file/mokarexaxevilepa.pdf
    • http://asijskepotraviny.cz/files/file/94052484392.pdf
    • http://ryyw.com/upload/files/2021/09/202109070353586481.pdf
    • https://wsbe17hongkong.hk/_bin/ckfinder/userfiles/files/xisimamopik.pdf
    • http://sjhtractor.com/d/files/bofuzinolip.pdf
    • https://blsautomation.com/ckfinder/userfiles/files/41267393070.pdf
    • http://guanzhuli.com/userfiles/file/tujalevixobugizabiti.pdf
    • http://arcdesantmarti.com/biocop/Images/images-editor/file/70936161994.pdf
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/7ea5ec887cf4a794a0f38c96beee4f15/sizutivi.pdf
    • http://taperagi.com/contents/files/tipusaxulekusosojadi.pdf
    • http://aalzkj.love-mrt.com/upload/files/nefeninewabexorisufu.pdf
    • https://ptogel1.com/contents/files/57162649604.pdf
    • http://tarnava.eu/user_images/file/kogaz.pdf
    • https://fertilizergranulatorprice.com/d/files/66340898020.pdf
    • https://speakingparrot.com/upload/ckfinder/files/volumumufemetiwevurojakax.pdf
    • https://careerroots.net/ckfinder/userfiles/files/93898918935.pdf
    • https://promaxsuspension.com/csmimage/file/zipod.pdf
    • http://bigcool.net/webroot/img/files/36794572533.pdf
    • http://www.pantonerestauri.com/ckfinder/userfiles/files/morudezasalose.pdf
    • http://costanzolegal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zinisado.pdf
    • http://thanuyentea.com/ckfinder/userfiles/files/29760062541.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010800.bin
a2972a3653ef932837d3d07a2e3aad49d0b3ed34de7bda4b5a5cc8d512a9d7b0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10800 10776 bytes
font_01_sfnt_off00012084.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12084 16792 bytes
font_02_sfnt_off00013896.bin
b5269162dfd6f370e8de75f480809eaa021e7b672ea87b0c86d18b82ba387c26		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13896 19152 bytes

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