Malicious PDF — malware analysis report

Static analysis result for SHA-256 fcefe3b46b2a7131…

MALICIOUS

PDF

80.9 KB Created: 2021-09-20 16:28:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 1b858d85ab98932ec1d4a75e7e002e34 SHA-1: 547a58485660dcc95c8e312dc14427ed3a746c85 SHA-256: fcefe3b46b2a71316e749ed42720e33b9af9c0881bf3756f3e1eb414aabbbe9e
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious. Heuristics indicate it functions as a link farm, containing numerous links to potentially disposable hosting sites, with a high number of distinct hosts. The embedded URLs, despite some being marked benign, are part of a broader pattern of redirecting users to external sites, suggesting a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

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://www.luthier-auxerre.fr/ckfinder/userfiles/files/7167256174.pdf In PDF document text
    • http://chiesamadremarsala.eu/userfiles/files/22027612317.pdfIn PDF document text
    • http://www.anglometais.com.br/adm/Editor/ckfinder/userfiles/files/5238261676.pdfIn PDF document text
    • https://atputasbazes.lv/images/userfiles/files/temipazanekokolib.pdfIn PDF document text
    • http://tnetimes.kr/upload/file///paziwawamogip.pdfIn PDF document text
    • https://andrejc.si/files/file/zalodegofirorow.pdfIn PDF document text
    • http://divapharma.com/uploaded/file/benurefikovaxi.pdfIn PDF document text
    • https://vico-inmobiliaria.com/ckfinder/userfiles/files/96528480806.pdfIn PDF document text
    • https://ppkh.net/userfiles/file/14093958810.pdfIn PDF document text
    • http://evo-models.com/uploads/userfiles/files/dirivowimerupegag.pdfIn PDF document text
    • https://arkadas.yuzuktr.com/eskortarama.com/resimler/file/muxinumok.pdfIn PDF document text
    • http://profstil.az/userfiles/file/86023002917.pdfIn PDF document text
    • https://rkdestate.com/userfiles/file/88365312638.pdfIn PDF document text
    • http://xn--oy2b19v1mb1yi.com/userfiles/file/kafosetugagubazadutitum.pdfIn PDF document text
    • http://chapelguild.com/images/usr/40325047902.pdfIn PDF document text
    • https://zahidnawaz.com/UploadedImages/image/rejigivanisegot.pdfIn PDF document text
    • https://kolkatanagariksammelan.org/ckfinder/userfiles/files/zitonetetudakuxib.pdfIn PDF document text
    • http://pngroup.pl/ckfinder/userfiles/files/16541955086.pdfIn PDF document text
    • http://hrudolf.com/userfiles/66212676605.pdfIn PDF document text
    • https://daynexweb.com/upload/ckfinder/files/84484220593.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613edbcc24e2f---bujuwemaxuwar.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137a80162f09---goweda.pdfIn PDF document text
    • https://rainbowfurnitures.com/files/files/jedogexubezivo.pdfIn PDF document text
    • http://kolaykanal.com/userfiles/files/75672279873.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=bmx+touchgrind+mod+apkPDF 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_off0000b995.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB995 10964 bytes
SHA-256: 003b5ec2849d1ec3d33818ca4e284c19164d0ca8f2a73ab9dcfa2a06fcb5aa7b
font_01_sfnt_off0000d2a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2A6 16232 bytes
SHA-256: 01cd0e4798e93fb086042d610f43ddeed7bf091af48aa863f5c4a4f61b651684
font_02_sfnt_off0000e87b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE87B 20748 bytes
SHA-256: 05619758fde653b82a60e593a7225ad9de4f275ffdcee2e0543e6d527d365238
font_03_sfnt_off00011d7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D7F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1