Malicious PDF — malware analysis report

Static analysis result for SHA-256 c97c0714600366fe…

MALICIOUS

PDF

82.9 KB Created: 2021-09-12 23:04:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cdd0cbd5e2361e0f1c56e2bf443a69ba SHA-1: 84bda72ba5ac7a0edce89948c2861013161cf70f SHA-256: c97c0714600366fefc96805f6c246688f44276fb430bf21a108402015d00ad29
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. The heuristic analysis revealed it functions as a link farm, directing users to numerous disposable domains, likely to facilitate the download of further malicious content. Although no scripts were directly extracted, the presence of embedded URIs and the overall structure suggest an attempt to trick users into visiting malicious sites, potentially leading to malware execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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 http://www.tobywells.org/media/fckdir/file/11396773435.pdf
    • http://kennycojewelry.com/userfiles/files/202109/1630517162.pdf
    • https://educationindiajournal.org/ckfinder/userfiles/files/juwurufifawizodev.pdf
    • http://criollo-cocoa.com/userfiles/file/20508867751.pdf
    • http://nguyenphat.com/public/default/ckeditor/files/guduriletato.pdf
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/efdk9ea3hsvjogleu1kijmsj6l/6599914709.pdf
    • http://qapoll.com/2015/vat/upload/files/wirenarivolenixumoxu.pdf
    • http://euro520.net/userfiles/file/16311670372077727590.pdf
    • http://fszhenjia.com/upfolder/e/files/20210910014236.pdf
    • http://pro-roubenky.cz/UserFiles/File/luxopigoxinoxam.pdf
    • http://ore-processing.ru/d/files/jikokopuvijaxakud.pdf
    • http://frankifoto.com/uploads/pages/files/bazowobokibatisazuwo.pdf
    • https://kingdomdatesuae.com/userfiles/files/lubefijaji.pdf
    • http://findmecakes.com/userfiles/files/87246397600.pdf
    • https://ecoquimica.cl/dinamicos/uploads/file/nadiderovunujebijer.pdf
    • https://olgunbey.com/upload/ckfinder/files/xilemumuxuribulumudije.pdf
    • http://tearose-kitchen.com/sites/default/files/images/imcefile/gilagiladij.pdf
    • https://tuvanthietke13-5.com/webroot/img/files/56773472627.pdf
    • http://salwex.hu/file/vazujaminorenunodovev.pdf
    • http://tfh-filter.hu/_user/file/67769783329.pdf
    • http://bebelino.ru/userfiles/file/pefosumamaresupaboweguwu.pdf
    • https://smartcirclegroup.com/userfiles/file/79951854222.pdf
    • http://annabarons.lv/files/files/13568735737.pdf
    • https://luatkhangthai.vn/upload/fck/file/56396452808.pdf
    • http://fuzoku-kyujin.jp/ckfinder/userfiles/files/vekubuvugot.pdf
    • http://klm-co.ru/foto/ck/files/migim.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=dream+league+soccer+2019+android+1
    • 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_off0000dc1f.bin
b0be286478d8c9f77cfc106f10b1f76b5d5c2bee0dd8a4d59c0b2fe615e01145		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDC1F 11180 bytes
font_01_sfnt_off0000f617.bin
fd61c0d9345b7bf80c84a8629b0a102a0edcc32dddb5ab96d4aedf6a49bd8372		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF617 18284 bytes
font_02_sfnt_off000125bd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x125BD 16792 bytes

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