Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d610afe6902a8bd…

MALICIOUS

PDF

89.6 KB Created: 2021-09-21 09:31:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 757e7042167de3a515f9d2de00e629b5 SHA-1: 334c53d99939b85d41f0fa45dac5b10a19debccc SHA-256: 7d610afe6902a8bd3e1c61fcca6a29c584af3398331b0935b21456c8ffe2790a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs and is identified as a link farm, suggesting it's part of a phishing or malware distribution scheme. The PDF structure and embedded URLs point towards an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://infrive.ru/uplcv?utm_term=mod+apk+games+offline
    • http://afro-safari.com/upload/files/19554121287.pdf
    • http://ecolservizinettuno.com/userfiles/files/baxubesuvalamaretujewutaz.pdf
    • https://tasivn.com/upload/ck/files/44041715796.pdf
    • http://surveycook.com/upload/tmp/202109/file/gobaridinobadovebi.pdf
    • http://sakuragiramenandsushi.com/uploads/files/gufawegutipoligozakef.pdf
    • https://laps.pl/userfiles/file/sotevizegutusokitofa.pdf
    • http://ducthanhtam.com/uploads/userfiles/file/bubipumasivejafe.pdf
    • https://kitchensofdiablo.com/upload/file/dibukitilojogigebego.pdf
    • https://capital-publishing.com/ckfinder/userfiles/files/sezapukegavutiki.pdf
    • https://transmar.biz/ckfinder/userfiles/files/17369783215.pdf
    • http://csc010.com/userfiles/file/20210909095148_92laxv.pdf
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/d7f50a7b210416ddb903d9993a4fecd2/23836800842.pdf
    • https://cahayamimpi1.com/contents/files/22659865621.pdf
    • https://bostoncake888.com/UserFiles/files/2550480266.pdf
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/16133dc9377ad6---69021107292.pdf
    • http://brixtontaxi.com/survey/userfiles/files/bedofuwe.pdf
    • https://www.hs-hofgastein.salzburg.at/ckfinder/userfiles/files/junekivuvinavosuwukenili.pdf
    • https://mytshirtcreator.com/app/webroot/files/file/notada.pdf
    • http://ckud.handysociality.com/upload/files/59773253432.pdf
    • https://nusantarabet4d1.com/contents/files/67112390032.pdf
    • http://uekekb.ru/!upload/files/nurizibepopogivadu.pdf
    • http://liavanhaeringen.nl/userfiles/files/nifesebabifa.pdf
    • https://www.stock2morrow.com/ckfinder/userfiles/files/mujagosiw.pdf
    • http://bluecars.pl/userfiles/file/wawufivu.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_off0000fa10.bin
cc36e1314040a6f76a1d2b8770f6c15def94591e51a62cf11dace12aed629704		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA10 10728 bytes
font_01_sfnt_off0001126f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1126F 16792 bytes
font_02_sfnt_off00012a81.bin
2a2e6f9cc813062157ab19f6344648429938b9e4852fadf60633accc3c6bc200		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12A81 17712 bytes

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