Malicious PDF — malware analysis report

Static analysis result for SHA-256 3cc1dc4d541599d3…

MALICIOUS

PDF

75.4 KB Created: 2021-09-10 01:58:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 97cbb51b470c71d6b7502ca6c8bc7c3d SHA-1: 2c89c8c061f07b03646146e29154c6ffb4a78bc0 SHA-256: 3cc1dc4d541599d3e1bc0ff211983be539e187cf5e5c0618a3146411d2e2a7f4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and is flagged as a link farm on disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious document, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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=suzuki+violin+book+3+pdf+free+download
    • http://reclameindex.nl/images/uploads/48793385671.pdf
    • http://elcivan.com/admin/UserFiles/file/ludabufiluwigosudub.pdf
    • http://xn--80aatg4aaaddkhfhbf3evf.xn--p1ai/ckfinder/userfiles/files/pibimunukunuzivebixeko.pdf
    • http://nirmalapublicschoolerumely.com/userfiles/file/fusoxuludinimoboj.pdf
    • http://abworder.com/uploads/files/60421129649.pdf
    • http://optikametuje.cz/userfiles/file/nawoxuruwerivasi.pdf
    • http://aibasavar.edu.bd/app/webroot/ckfinder/userfiles/files/32346435327.pdf
    • http://shriadinathbank.com/uploads/79779943427.pdf
    • http://yepuco.com/uploads/files/tubisuwuzadono.pdf
    • https://hattshopping.com/admin/assets/images/ckfiles/lawilurejisizo.pdf
    • http://old.bgk-meshkova.com/ckeditor/ckfinder/userfiles/files/nulurejatisig.pdf
    • http://chemtron-vostok.ru/media/file/73646774294.pdf
    • http://decaldankinh.net/upload/files/15523710329.pdf
    • http://bonezi.morefriendship.com/upload/files/soveretudumutanutezom.pdf
    • https://codecs.ro/images/file/zenogu.pdf
    • http://dok-vo.ru/userfiles/file/29012177841.pdf
    • http://www.dr.schure.net/ckfinder/userfiles/files/80708096262.pdf
    • http://bridgeonlaw.com/filespath/files/20210904220249.pdf
    • http://ayhancevik.com/images_upload/files/liwoxotenopoj.pdf
    • http://qianlong99.org/ckfinder/userfiles/files/girobijidago.pdf
    • http://receptlap.hu/files/43595720449.pdf
    • https://china-glass-mosaic.com/userfiles/files/20210903_141015.pdf
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/16130cfc5a3a78---4162131261.pdf
    • http://wabasnb.com/files/fckeditor/file/8095828476139e8d502ee0.pdf
    • http://sushibelovo.ru/files/fususazopexaduwa.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_off0000c1a1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC1A1 16792 bytes
font_01_sfnt_off0000d9b8.bin
f55035075798867f9a631b878d435d1194be46ff5598f47d2ab243c6dbdff26c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD9B8 11016 bytes
font_02_sfnt_off0000f355.bin
8e6f7f7dc277b341a761c9b6e806e149bf3ce1f42805085dd0e0e3d2d3db362c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF355 17332 bytes

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