Malicious PDF — malware analysis report

Static analysis result for SHA-256 28028b43fb9b619c…

MALICIOUS

PDF

85.4 KB Created: 2021-09-12 03:50:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 75bcbbf93e4c0c315db5b815adddf88d SHA-1: 4139d5b547cb3e33f99401977fc0f28e19e9552c SHA-256: 28028b43fb9b619c631a512af8bc3ff7944b75921904dd4fb1d85b180d89a6c7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable domains and are structured as a link farm, a common tactic for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were extracted, the structure and URL patterns suggest the document is designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://www.poliklinika-hb.cz/userfiles/file/gunosogikamosu.pdf In PDF document text
    • https://quangcaowebsitecomvn.xemlaco.com/uploads/files/jexef.pdfIn PDF document text
    • https://southwestlooms.com/admin/userfiles/files/50595725881.pdfIn PDF document text
    • http://jubileejec.com/userfiles/files/14273265006.pdfIn PDF document text
    • http://land89.com/ckupload/files/76428862773.pdfIn PDF document text
    • https://fcksa.com/ckfinder/userfiles/files/xuzitid.pdfIn PDF document text
    • https://telliogluhukuk.com/userfiles/file/28458494164.pdfIn PDF document text
    • http://vouchertiket.com/airplane/ckeditor/uploads/files/86312341021.pdfIn PDF document text
    • http://macro-e.com/app/webroot/userfiles/files/jumojobenonejowosi.pdfIn PDF document text
    • https://kisikana.hr/userfiles/file/rijasagigujafosobizopadi.pdfIn PDF document text
    • https://kstraders.com/userfiles/file/mukup.pdfIn PDF document text
    • http://litho-and-co.fr/ckeditor/upload/files/12597075841.pdfIn PDF document text
    • http://ville-dammarie.com/ckfinder/userfiles/files/71293180222.pdfIn PDF document text
    • http://divorce-difficile.fr/userfiles/file/gebatapifenokuzojurizuw.pdfIn PDF document text
    • https://needlugs.com/userfiles/files/47912553431.pdfIn PDF document text
    • http://handlpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sababo.pdfIn PDF document text
    • http://tajesink.com/Uploadfiles/files/gararizolimu.pdfIn PDF document text
    • http://oilspecchem.com/files/wotuxuvenobafabu.pdfIn PDF document text
    • http://simkoongschool.com/uploads/editer/files/15582580253.pdfIn PDF document text
    • http://riversedgefm.com/files/file/minudadoputinidel.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=mg3660+wireless+setupPDF link annotation
    • https://cakamuzejs.riga.lv/ckfinder/userfiles/files/manidurekawijosapojedav.pdfIn PDF document text
    • 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e8f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8F4 17820 bytes
SHA-256: f4faba977c0e9e3d52c853262f27751b8567090e2eb5b707c85e741b769b5fab
font_01_sfnt_off00011725.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11725 10684 bytes
SHA-256: 030007d760cd2fad52837fa0689323e4422b6fec571c007905517e79483119dc
font_02_sfnt_off00012ff6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FF6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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