Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd5f545020db5ba4…

MALICIOUS

PDF

73.3 KB Created: 2021-09-28 14:17:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 66cabe2cb43d498afb4788ad6863cd06 SHA-1: 0e9589edd83c20c2cc190ccd2dc53dee19c32283 SHA-256: dd5f545020db5ba4655fd29acf0252a81969dbc31a60bf4761414b12f7df5d60
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to disposable domains, indicating a link farm or phishing lure. Heuristics like PDF_RANDOM_URL_LINK and PDF_SEO_DISPOSABLE_LINK_FARM strongly suggest malicious intent. ClamAV detection further confirms its malicious nature, classifying it as Pdf.Phishing.Trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://pixomot.ru/uplcv?utm_term=went+from+iphone+to+android+and+not+receiving+texts PDF link annotation
    • https://musikkursus.dk/userfiles/file/wagimawonu.pdfIn PDF document text
    • http://www.w.radeton.cz/ckfinder/userfiles/files/xenofug.pdfIn PDF document text
    • http://rsti.biz/files/fck/file/22825096512.pdfIn PDF document text
    • http://contrast.no/ckfinder/userfiles/files/83298751041.pdfIn PDF document text
    • http://autoset66.ru/admin/ckfinder/userfiles/files/valunufodipu.pdfIn PDF document text
    • https://nikken-engineer.jp/export/sd205/www/jp/r/e/gmoserver/8/6/sd0748886/nikken-engineer.jp/fckeditor/upload/file/rekabejabibesa.pdfIn PDF document text
    • https://onutglen.com/caningest/images/file/28082132868.pdfIn PDF document text
    • http://steinbach.casawell.tw/userfiles/file/potigi.pdfIn PDF document text
    • http://minuspk.ru/minuspk.ru/userfiles/file/68865141475.pdfIn PDF document text
    • http://starwindows.ie/ckfinder/userfiles/files/86161716456.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/2f62b4e85fd7e735b01b649b66de49ed/20383024132.pdfIn PDF document text
    • http://autoachtercamper.nl/userfiles/file/puxuwokolinisogilute.pdfIn PDF document text
    • http://aci-immobilier-douai.fr/userfiles/files/tadetinexokabodetokafibuw.pdfIn PDF document text
    • http://lucidarepavimentimarmogenovaealessandria.it/userfiles/files/64176326506.pdfIn PDF document text
    • https://lompatjauh.com/contents/files/32570594989.pdfIn PDF document text
    • http://thermogroup.ru/uploads/files/sekugezuj.pdfIn PDF document text
    • https://pbchistoryonline.org/uploads/file/17556281678.pdfIn PDF document text
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/98426993028.pdfIn PDF document text
    • http://puzynowska-kancelaria.com/userfiles/file/20814104407.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/bb413dfdef802aadd89b5da2ca05c7ef/7768561597.pdfIn PDF document text
    • http://stamforgtechnologies.com/uploads/xoxex.pdfIn PDF document text
    • http://brlairport.com/images/file/daparop.pdfIn PDF document text
    • http://uptownchantilly.com/uploads/files/nesuwunapoduneredog.pdfIn PDF document text
    • http://flightshop.jp/images/blog/file/mugixibe.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b390.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB390 11184 bytes
SHA-256: 71d0f1836b7a285f60053abcc684e0698c3fc9e60a5e7296a0ae5f880e6328d5
font_01_sfnt_off0000cd64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD64 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e576.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE576 18416 bytes
SHA-256: b2b013015fcc9df9a858042a50a7bafb63ebe4400c3413fafe4b6764641b46a2