Malicious PDF — malware analysis report

Static analysis result for SHA-256 2fcae3ca080d170f…

MALICIOUS

PDF

82.7 KB Created: 2021-09-24 02:49:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 35de98361ea54fb736247870cd4e0325 SHA-1: a7d5e8a86caac2e1ed7e46574a7986e8268dda23 SHA-256: 2fcae3ca080d170fa124ba39e538bec54d11a3bac06a3059340645d49d4569a8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as a malicious PDF by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs and is identified as a link farm on disposable hosting, suggesting it's used to redirect users to potentially harmful websites. The presence of embedded URLs and the overall structure point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://smidgel.ru/uplcv?utm_term=double+dragon+trilogy+apk+obb
    • http://nujhimachal.in/img/uploads/files/sasabamewokesu.pdf
    • http://caratow.nl/userfiles/file/60560367139.pdf
    • http://www.hussco-steel.com/husscofiles/files/zidonigajajumemo.pdf
    • https://videoeffect.ir/data/file/bumuxoginemumobi.pdf
    • http://ultrabeauty-ff.ru/userfiles/file/jelawugilore.pdf
    • http://vaikevai.com/ckfinder/userfiles/files/58304320843.pdf
    • https://pingthye.com/userfiles/files/pabaruvezotibarowatu.pdf
    • https://aodaixuan.com/app/webroot/upload/image/files/kositazurokalobulemeliza.pdf
    • http://bfr-bialapodlaska.pl/userfiles/file/samaloselotiji.pdf
    • http://gruppocinofilomarsalese.com/userfiles/files/90656039014.pdf
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/161350c5c40c8c---tewurazaxutasomoferu.pdf
    • http://triple-a.co.th/ckfinder/userfiles/files/zuwubepadig.pdf
    • http://clinicaveterinariabilancino.it/userfiles/files/84586287880.pdf
    • http://trustycctv.com/ckfinder/userfiles/files/69726693888.pdf
    • http://fotografiafrancescosomma.com/userfiles/files/gabawel.pdf
    • https://cosmetic.dilen.top/upload/files/28218585852.pdf
    • https://etravelbox.com/scgtest/team-explore/uploads/files/zisidavaxeborixijogusuf.pdf
    • http://bbbo.handyfriendship.com/upload/files/31658189567.pdf
    • https://gemicilojistik.com/userfiles/upload/file/sofinagudap.pdf
    • http://3xlove.com/uploadfile/file/95566098139.pdf
    • http://confidenzacsapagy.hu/upload/57018494536.pdf
    • https://transport.frontiermyanmar.com/sites/all/libraries/ckfinder/userfiles/files/zebedokesexovabuxanala.pdf
    • https://aventura-agence.lu/userfiles/files/viwopum.pdf
    • https://hamzsabegi60szallo.hu/UserFiles/File/41445382534.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_off0000d5b5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD5B5 16792 bytes
font_01_sfnt_off0000edcc.bin
3f7d815eaffce5213b5f6e606189a945067118c179ed944968cb9a0a092e22ba		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEDCC 10848 bytes
font_02_sfnt_off0001067c.bin
65f8fdadc2624bb1e5ae6a13555c09d123c25e7b0427c9c641235c73c1740be7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1067C 20852 bytes

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