Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c05b25af1d48ff5…

MALICIOUS

PDF

130.3 KB Created: 2021-10-08 10:37:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 3571f4c760e99439a25b829ed4650106 SHA-1: 7f843f40b22179935c73f7215f240389c23f5b18 SHA-256: 2c05b25af1d48ff57b71f5201fc94a603415081d73f52fd4c7848380a17a4d0c
126 Risk Score

Malware Insights

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

The PDF was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It functions as a link farm, containing numerous embedded URLs pointing to other PDF files hosted on a variety of domains, many of which are unknown or potentially suspicious. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using many distinct hosts with few links per host, a common tactic for distributing malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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 http://entrackintl.com/uploads/dazumivizovul.pdf In PDF document text
    • http://travelcenterpuntos.com/campannas/file/puziwoguguberotopoboko.pdfIn PDF document text
    • http://getem.pl/files/file/89504474475.pdfIn PDF document text
    • http://webs123.com/userfiles/file/zefilumubelexeverozu.pdfIn PDF document text
    • http://forumcutuca.com/ckfinder/userfiles/files/gapukeme.pdfIn PDF document text
    • https://sportsht.com/userfiles/file/93110763032.pdfIn PDF document text
    • https://www.le-domaine-de-hauterive.fr/ckfinder/userfiles/files/vulariviwekesinibajama.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/12568539813.pdfIn PDF document text
    • http://i-tos.com/userData/board/file/64227580206.pdfIn PDF document text
    • https://natyabio.com/uploadfiles/kigut.pdfIn PDF document text
    • https://kratky.eu/files/file/85225421192.pdfIn PDF document text
    • http://bftt.marketsearching.com/upload/files/gifavejebamafunamizukuti.pdfIn PDF document text
    • https://pasarant0g3l-turbo-h1t.com/contents/files/raxuzudojajizodagaz.pdfIn PDF document text
    • https://cribpointonline.org/cribpointonline/userimages/file/kizokobogizalasoxatudovug.pdfIn PDF document text
    • http://alfonsoguiggiarchitetto.it/userfiles/files/19646495471.pdfIn PDF document text
    • http://architettobotteonpierpaolostudioabacus.it/userfiles/files/kukikagonedema.pdfIn PDF document text
    • http://hebakotb.net/userfiles/file/77870134928.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161382c5102988---88669173714.pdfIn PDF document text
    • https://newcar-rental.com/uploads/files/202109042344243269.pdfIn PDF document text
    • https://swalaya.in/userfiles/file/57563117765.pdfIn PDF document text
    • https://artofsurfing.com/preview/ckfinder/userfiles/files/pimajiz.pdfIn PDF document text
    • http://styrexon.cz/userfiles/file/fugisidimilobozonemimu.pdfIn PDF document text
    • https://pannonfinanz.eu/editor_up/vavosomi.pdfIn PDF document text
    • https://ku4ysk-9lgp4y.com/contents/files/fokanenuvo.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145730517561---kubokoxebidotodud.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=how+to+close+fastbootPDF 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_off00018e27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18E27 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001a63e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A63E 10248 bytes
SHA-256: e27ae858904d7ac57b22ecd332902a63364e9d0b3e22dbf28191b597ed9b7910
font_02_sfnt_off0001bd81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BD81 24072 bytes
SHA-256: 45d84f0a97be9f5cd315743b3977df251c35fc2b2ad3d3b1bb151e341b8a3d6b