Malicious PDF — malware analysis report

Static analysis result for SHA-256 84f9e38bf1e69d83…

MALICIOUS

PDF

72.3 KB Created: 2021-09-18 18:12:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e56eaa070d8642077cd431ee206f3788 SHA-1: eb58f0cbdcef661796c12b0e020dc04efe5e3586 SHA-256: 84f9e38bf1e69d83140b29e216777a85cc81f4a51ae8197e52074c590995aef0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains, and one heuristic identifies it as a link farm. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics suggest an attempt to redirect users to malicious sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

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://tdbakademi.org/userfiles/files/fozofubit.pdf
    • http://geomanteia.com/userfiles/files/80698422108.pdf
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/8a213acfdaf02736faf475f8825c4661/91187948901.pdf
    • https://iuoshili.com/upload/users/files/pasuw.pdf
    • http://zartmobilia.com/userfiles/file/20210914042938.pdf
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16132db433feae---nunusemifubagutoxogineve.pdf
    • http://www.trisad.kz/ckfinder/userfiles/files/pijedagamijokomavodero.pdf
    • http://aalzkj.love-mrt.com/upload/files/29112787293.pdf
    • http://wannawwannie.pl/userfiles/file/90217801246.pdf
    • https://mintowncoffee.net/uploads/images/files/labita.pdf
    • http://kleiberit.ru/files/file/51114463248.pdf
    • https://5udua.com/contents/files/tamomo.pdf
    • http://metabolizmusonline.hu/images/upload/file/bazinefimedaluzewilirexu.pdf
    • https://birotex.rs/images/files/rusunakajaneku.pdf
    • http://videofilm-tv.ru/content/File/baxesesibakatuminobowetit.pdf
    • http://mevlanaasm.com/resimler/files/femixosogikizumorofeseme.pdf
    • https://cemb.ca/upload/editor/file/3234953596.pdf
    • https://leavereview.com/customerinterview/ckfinder/userfiles/files/35915570649.pdf
    • https://webornate.com/viking1/uploads/files/kiponebudipunojuriwi.pdf
    • http://annabarons.lv/files/files/wuxijumejavu.pdf
    • https://livewireeventz.com/userfiles/file/77097891137.pdf
    • http://cungcapbaoduongcuanhatban.com/upload/files/87827020680.pdf
    • http://hitecds.com/userfiles/file/70164119818.pdf
    • http://tmkb.org.tr/ckfinder/userfiles/files/70804856545.pdf
    • https://bevasilicones.in/userfiles/file/42150421510.pdf
    • https://icbacademy.com/upload/files/dikuvuderabitufawukuferu.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=private+calculator+apk
    • 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_off0000bcbc.bin
0505eac609ebb5a6fe9dd29a239e6170053242ad093733e5e0f99ac09af04f4c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBCBC 15512 bytes
font_01_sfnt_off0000e418.bin
d48123aa6ebdeb9f1e18017b1c0739bbfea7a3130f1725d3512b2a90c1103139		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE418 10352 bytes
font_02_sfnt_off0000fba4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFBA4 16792 bytes

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