Malicious PDF — malware analysis report

Static analysis result for SHA-256 dec798649c3e78ac…

MALICIOUS

PDF

82.9 KB Created: 2021-09-09 11:24:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4195fb4fd79d21ae28ad0220e6e15630 SHA-1: 9746d4af380db83734a778f1ce3289b572cde34e SHA-256: dec798649c3e78ac3ba809b6a4d1de43a23f41824632a31e0f414f65f033ea89
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many pointing to disposable domains, suggesting a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate a strong intent to facilitate phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://bwemfjhjk.friend-match.com/upload/files/gomatugejozi.pdf
    • http://tayles.com/uploaded/72387861998.pdf
    • http://albino-pitti.com/pub_img/file/67009924491.pdf
    • http://thienlongadv.com/upload/files/zavenopunizimulaweso.pdf
    • https://silverbirdmarketing.com/pages/images/file/27483141961.pdf
    • http://www.atccs3.it/atccs3/fckeditor/editor/ckfinder/userfiles/files/52198540488.pdf
    • http://campbellelectronics.com/uploads/pugamuzesadabu.pdf
    • http://jamesandsons.ca/userfiles/file/54513076902.pdf
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/161380c69319b8---82211160127.pdf
    • http://larben.cz/media/images/upload/file/novibetugetokonomub.pdf
    • http://polyalpan.hu/_user/file/73328255442.pdf
    • http://canadianrockies.info/files/file/575530031.pdf
    • https://www.db-ynox.fr/ckfinder/userfiles/files/gokakumapuk.pdf
    • http://cmuniontravel.com/userfiles/file/6597839456.pdf
    • https://ariaparvaz.com/basefile/ariaparvazcom/files/muxizasuge.pdf
    • https://nonbodepsg.com/uploads/files/taruvetuten.pdf
    • http://fobosgrunt.ru/files/ckfinder/files/33440859837.pdf
    • https://www.marjojaspers.nl/ckfinder/userfiles/files/legapeguzokufar.pdf
    • http://orthopaede4you.de/userfiles/file/mewakekomixejesejevedu.pdf
    • http://alnadaoil.com/userfiles/file/99301470790.pdf
    • http://tzsunup.com/upload/83302648288.pdf
    • https://venus-forever.com/image/files/86466156987.pdf
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613750309fc98---18342189202.pdf
    • https://aiwatopup.com/ckfinder/userfiles/files/50207863218.pdf
    • http://leebyenghun.com/new/upload/board/files/gibidejasedarulakiwera.pdf
    • http://dongzzang.com/userfiles/file///duseluve.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=cheat+droid+app
    • 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_off0000dbfc.bin
c66931bedbbb9e08800d3b47997581bda33d837a9c69faa9e02e97884e4b3899		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDBFC 19488 bytes
font_01_sfnt_off00010ed8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10ED8 16792 bytes
font_02_sfnt_off000126ef.bin
45b42f6762ca864c2d92aa6516cfbf7cc16f276b58a17acded59ee6b1cbc137b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x126EF 10204 bytes

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