Malicious PDF — malware analysis report

Static analysis result for SHA-256 baf1819476ff02ba…

MALICIOUS

PDF

82.9 KB Created: 2021-10-08 05:09:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: a9443ae9ba1f3a4fcc4ba02d0d80a592 SHA-1: 5079bb63977bdfc4f48667df6ed06f9375d35d03 SHA-256: baf1819476ff02babe17ecc9fb13ab357f8af74ef93b53ad0dd955d1f4c2ebcb
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, many pointing to disposable domains, characteristic of a link farm used for phishing or malware distribution. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded links suggest it's designed to trick users into navigating to malicious sites, likely to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://cgmorenanews.com.br/ckfinder/userfiles/files/lasofudiwixez.pdf In PDF document text
    • http://tacchigroup.com/public/thread/risorse/file/12265322244.pdfIn PDF document text
    • http://webcertain.asia/contentupload/fckeditorUploads/organization_/file/95441007903.pdfIn PDF document text
    • https://materiale-parchet.ro/fisiere/file/gifefajananeni.pdfIn PDF document text
    • https://dichocungtoi.com/userfiles/file/81181270378.pdfIn PDF document text
    • http://parentini.it/userfiles/files/modosuj.pdfIn PDF document text
    • http://hengfengpaper.com/filespath/files/20210909092541.pdfIn PDF document text
    • https://netron.pt/app/webroot/media/files/80348010557.pdfIn PDF document text
    • http://safiorida.nl/operatori/userfiles/file/75723009911.pdfIn PDF document text
    • http://christ-china.com/filespath/files/20210904022217.pdfIn PDF document text
    • http://travelport.pl/userfiles/file/napufosonesemenapujo.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615b86fc9a781---50614342612.pdfIn PDF document text
    • http://aroma-es.red/yamituki-n/uploads/files/molipaxi.pdfIn PDF document text
    • https://tedvandergulik.nl/userimages/file/84170380816.pdfIn PDF document text
    • https://www.fangjin.org/ckfinder/userfiles/files/kijosurupigikuzi.pdfIn PDF document text
    • http://habitat3.eu/userfiles/files/69736888900.pdfIn PDF document text
    • https://escaletravel.com/userfiles/files/91609225599.pdfIn PDF document text
    • http://www.sas.edu.mn/ckfinder/userfiles/files/penakupegesulusadob.pdfIn PDF document text
    • https://eprobatdz.com/ckfinder/userfiles/files/25360471891.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/ef09ed996ed9e26c2011c31bf96955f3/xibozalom.pdfIn PDF document text
    • http://www.deco-interieure.com/userfiles/file/pariwovewefu.pdfIn PDF document text
    • http://www.prctech-th.com/ckfinder/userfiles/files/48622464641.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=certified+scrum+master+test+answersPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD38 10688 bytes
SHA-256: dc28e72b51e1f989d9ae4990de17efcacf3f1402bf67c9b1d4cf793c367057ef
font_01_sfnt_off0000f5d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5D4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010de6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DE6 18328 bytes
SHA-256: 03caf3ca9b91a82119c40390585e12e66f17950d8bd3ab631f1534259f6ecc2b