Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d546349468858c2…

MALICIOUS

PDF

71.9 KB Created: 2021-09-24 14:21:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bdf7cdc2f53ef7d350c664ae20c27d2e SHA-1: 93c8a81aee171eb22476193c7ce7b27c8d74ced0 SHA-256: 7d546349468858c2d4ba75584a4ddd9b99f205798802fc399fa48afe9ebf65f9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF document flagged by ClamAV as a phishing trojan. It contains numerous embedded URLs, many of which point to PDF files, suggesting a link farm or redirection mechanism. One URL specifically mentions 'sdk download for windows 7', indicating a lure for users seeking software. The PDF structure and embedded content are consistent with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9885

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://ardennes.proximeo.com/ckfinder/userfiles/files/roduzebesoj.pdf
    • http://suurelepa.ee/data/file/32313056324.pdf
    • http://space-edge.com/upload/files/89324625671.pdf
    • http://hftyby.com/upload_fck/file/2021-9-6/20210906150056136497.pdf
    • http://positiveforce.in/uploads/files/60965595155.pdf
    • http://backkwang.com/userData/board/file/zipol.pdf
    • https://fullgame.hu/uploads/files/pekaforuza.pdf
    • http://veganogle.es/uploads/ckfinder/files/40815148309.pdf
    • http://mirutte.com/newsfiles/files/netid.pdf
    • http://aftckwt.com/uploads/file/kekibuwetifosijiwazorelad.pdf
    • http://chiaranannini.com/userfiles/files/netoguronibazudasug.pdf
    • http://seattledesis.com/fckeditor/file/95291875214.pdf
    • http://shipagents.nl/uploadfiles/file/3479844608.pdf
    • https://accesoriosalmayor.com/images/userfiles/file/76822525844.pdf
    • https://learnrkb.jugalbandiresearch.com/ckfinder/userfiles/files/rukam.pdf
    • https://branchennachweis.eu/userfiles/file/79308821668.pdf
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/161313bd19d54b---motaradudajofexuno.pdf
    • http://jezirka-biobazeny.cz/UserFiles/File/85242680387.pdf
    • http://my-hustle.net/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/95801777144.pdf
    • http://nanopena.cz/upload/file/musobufate.pdf
    • https://clifestyle.net/uploades/userfiles/file/pitikipupodeg.pdf
    • https://univerosg.com/ckfinder/userfiles/files/75034054114.pdf
    • https://hoangphatdanang.com/uploads/image/files/gabirinasewarodagubovusux.pdf
    • https://habibitours.com/ckfinder/userfiles/files/zejesapiregukibi.pdf
    • https://piphoto.tw/uploads/files/202109130257176153.pdf
    • http://kpdb.org/userfiles/files/21683412343.pdf
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/161410e5c7a74e---nunanuvejewir.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=sdk+download+for+windows+7
    • 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_off0000b5ea.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB5EA 16792 bytes
font_01_sfnt_off0000ce01.bin
86311cb47770f222ac155fb0e4b94afde8f593430206b1bae4d41e169c629a23		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCE01 10420 bytes
font_02_sfnt_off0000e5ce.bin
0760fa8da7ab22eef934247e6764060e6c8632b2a5ebd2d63eaa62ee2e43b7ae		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE5CE 17148 bytes

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