Malicious PDF — malware analysis report

Static analysis result for SHA-256 f28edfc31d39d18e…

MALICIOUS

PDF

69.6 KB Created: 2021-09-29 08:08:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c3b766c8bd8765a6ddbf22172448e48b SHA-1: 4e84037db4a0739272607fdf7f555d76831e8d58 SHA-256: f28edfc31d39d18e987abae794e106a417980660f1764b7d6971c8fca82d0591
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to other PDF files hosted on external domains. This structure is indicative of a link farm designed to obscure the ultimate destination or to distribute further malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://pixomot.ru/uplcv?utm_term=best+emulator+apk
    • http://hflchw.com/upload/file/wowevibupeju.pdf
    • http://axwelindia.com/uploads/kuwomusejigefipovak.pdf
    • https://bharatbiodiesel.com/userfiles/file/fiwamipero.pdf
    • https://giriconsultancy.com/content_files/files/zirevidalujakodusifax.pdf
    • http://szentdorottyapatika.hu/files/xukokiridilejib.pdf
    • http://bowlingkillers.com/imgdb/files/zogajabowezunegegimakol.pdf
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/1613da2d0e635a---44525422489.pdf
    • http://win-sonic.com/ck_imgs/files/moguro.pdf
    • http://hwayinn.com/image/files/20210917_002016.pdf
    • http://candleelectricals.com/uploaded_files/userfiles/files/tapaviri.pdf
    • http://work4shop.cz/userfiles/file/xenozumiruwa.pdf
    • http://spartaksedlec.cz/spartaksedlec/userfiles/file/zokojubosutel.pdf
    • https://www.anoregmt.org.br/ckeditor/ckfinder/userfiles/files/rupiw.pdf
    • http://e-pisanie-prac.pl/famprojekt_z_serwera/images/file/42962235643.pdf
    • http://compow.net/ckfinder/userfiles/files/5595919623.pdf
    • http://muszempilla.com/files/file/neleworamudimozefo.pdf
    • https://theshamrockpublecco.it/file/80611188679.pdf
    • https://implantsdentairesdesmoulins.com/upload/editor/file/23327302754.pdf
    • https://thieumaunao.vn/workspace/develop/uploads/ck_upload/files/nisodezovazojevijajomex.pdf
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161480b2b2fc4d---1787232543.pdf
    • https://hk-delight.com/UploadFiles/file/lidawiruxen.pdf
    • http://citadelcaralarms.com/userfiles/file/mowupojibeli.pdf
    • http://reklama-kemerovo.ru/files/files/15628547446.pdf
    • http://shengyaweb.com/uploadfile/file/2021090713424610.pdf
    • https://proxus.nl/file/11997757694.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_off0000b32f.bin
c96ba6a6fb6db110d90d96c8681421c1fdcd31a132abe0ea4c8a1b1e8f0d91c0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB32F 10464 bytes
font_01_sfnt_off0000cb11.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCB11 16792 bytes
font_02_sfnt_off0000e323.bin
742d694cf6f5bed3b99aece9a486407121c32a8529b07cf5b61737132134023b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE323 14876 bytes

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