Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f6d3e897f5d3393…

MALICIOUS

PDF

89.6 KB Created: 2021-09-09 02:14:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f8a58505fdee51516c1357a4f6a71ac3 SHA-1: 904812f02559855402fa50437fcd932ddd651d91 SHA-256: 8f6d3e897f5d3393ab7c1292697fde60787735dd3712fb816ea768289ea8fe02
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external URLs, including one hosted on a raw IP address. The presence of numerous embedded URLs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest a phishing or malware distribution attempt, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9933

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16137d02b43cb0---tanojaxaminoladozenopag.pdf In PDF document text
    • https://mavibusiness.it/file/jedigobabefipo.pdfIn PDF document text
    • http://biogenetec.tw/image/files/20210907_005119.pdfIn PDF document text
    • http://vonschickenconcord.com/uploads/files/felubuxilogiboxel.pdfIn PDF document text
    • https://5uempat.com/contents/files/marewamubunat.pdfIn PDF document text
    • https://khanoomhoteli.com/basefile/khanoomhotelicom/files/94997397319.pdfIn PDF document text
    • http://tetrafluoro.com/upload/files/nugetuwarel.pdfIn PDF document text
    • https://loffoxfitness.mvwebsolution.com/userfiles/files/sexuboxetilaxeb.pdfIn PDF document text
    • https://ajwatravel.com/wheelmarine/userfiles/file/28799939804.pdfIn PDF document text
    • http://appli-veolia.net/ckfinder/userfiles/files/71313929197.pdfIn PDF document text
    • http://aviteksural.ru/admin/ckfinder/userfiles/files/26054713655.pdfIn PDF document text
    • http://turagent007.ru/userfiles/file/49735234661.pdfIn PDF document text
    • http://paulgraphics.paulsfashion.in/files/vizowatuj.pdfIn PDF document text
    • http://xn--2e0b95unoa536adofm5h.com/userfiles/file/79078567717.pdfIn PDF document text
    • http://galsabino.it/userfiles/files/20729083061.pdfIn PDF document text
    • https://brakos.it/file/bomubosa.pdfIn PDF document text
    • http://tubelessons.net/cms_images/file/pawawomujazaxavaledibu.pdfIn PDF document text
    • https://ozanetiket.com/TasarimAcarnet/serhali/upload/files/35298440723.pdfIn PDF document text
    • http://eviljoy.com/UserFiles/File/17887729217.pdfIn PDF document text
    • http://robertwestlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/17030996021.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/mr1ivrrsr517cd4g82ra0sob3s/99884253454.pdfIn PDF document text
    • http://n-production.com/upload/fckeditor/file/pasojexefuxukitilef.pdfIn PDF document text
    • https://thaibamboorestaurant.ca/phpsites/bard_ford/uploads/file/8012717892.pdfIn PDF document text
    • https://www.tahitotfalu.hu/ckfinder/userfiles/files/risamagibasifaletetakin.pdfIn PDF document text
    • http://185.33.116.145/~acus01/upload/files/19607296181.pdfPDF link annotation
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=lulubox+latest+apk+downloadPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB2A 18376 bytes
SHA-256: 8bf86fc9c9b77003c3620fe9ec50829499ba96f00cac5cb4faaf20378a02b5c3
font_01_sfnt_off0000f831.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF831 18264 bytes
SHA-256: f491b2330a36274a7cb989f7248f9099c783d76e0335fa544a775267abbd0a8f
font_02_sfnt_off000127a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127A8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00013fbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FBF 10668 bytes
SHA-256: 770192859b2df68c64fc00da1ef3ec3e85fedf0009d344a409ab29f6e93da740

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