Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d50b2b3cf537537…

MALICIOUS

PDF

80.1 KB Created: 2021-09-12 01:18:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5a55d31b60527c5736d38d953ff9e7ac SHA-1: d0783bc7b4ed3d8d699c6e18a87899d643f42bfb SHA-256: 3d50b2b3cf537537feadd64de37e8422de6f163087462e313414a8874d561b16
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by multiple heuristics as malicious, including a link farm on disposable hosting and a high ML classifier score. The embedded URLs and the PDF structure suggest an attempt to redirect users to potentially harmful websites. The ClamAV detection further confirms its malicious nature, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 http://badaranquehablar.com/userfiles/files/35547102220.pdf
    • http://www.ih-consultant.com/ckfinder/userfiles/files/goxajilodavesodapawiwemed.pdf
    • http://caogenzhiben.com/filespath/files/20210906041134.pdf
    • http://toyotacri.com/userfiles/files/palotemejatirodefi.pdf
    • http://reutlinger.pl/userfiles/file/92882945631.pdf
    • https://cpsguffanti.com/uploads/file/53287952161.pdf
    • https://anitt.in/ckfinder/userfiles/files/wexomokajiwameput.pdf
    • http://qtjdb.com/UploadFile/2021/09/07/file/20210907_192107_156.pdf
    • https://menokatea.in/ckfinder/userfiles/files/36012882921.pdf
    • https://alyosserspneed.com/userfiles/files/23743695733.pdf
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/f61picjk1dudj1ucljamvr4h4r/paxajimuvofujetaxefinolon.pdf
    • http://cerrutistudio.eu/userfiles/files/82426013788.pdf
    • https://telorgabus.com/contents/files/33091249890.pdf
    • http://avvocatogiuliani.it/userfiles/files/dewuju.pdf
    • https://jf-orvalho.pt/userfiles/file/74686857043.pdf
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/16130690eab4be---fazolorewi.pdf
    • https://stomatoloska-ordinacija-rijeka.com/files/1826729548.pdf
    • https://mondoaudio.it/img/uploaded/file/potabufubepopetorisukemu.pdf
    • https://corpusbg.com/files/fck/file/766588729.pdf
    • https://pharmnet.cz/ckfiles/files/files/govepazag.pdf
    • https://belitour.ir/basefile/belitourir/files/66019104478.pdf
    • http://oshcongregation.com/userfiles/file/28158161418.pdf
    • http://15449010.com/FileData/ckfinder/files/20210905_0DE98CA8D4B6578B.pdf
    • http://vecsecity.info/editor_up/rafovenunebasefojejavoxa.pdf
    • http://huucodatlanh.com/userfiles/file/96432937030.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=the+shadow+of+the+great+game+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_off0000d720.bin
1d22517851cf1adbb7332aecda0b7ab2ce3f94322a93e81ebd9fca289d25f3c2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD720 10752 bytes
font_01_sfnt_off0000efc2.bin
fbafd27cb8eff7f9b7fb10093956172658c0547b68cb1caa643ccb308bc37dd6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEFC2 16704 bytes
font_02_sfnt_off00011aa4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11AA4 16792 bytes

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