Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfb4ebda58de4874…

MALICIOUS

PDF

67.7 KB Created: 2021-09-12 08:59:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 021ad55cf626fdd0f7ba81f0a47582c1 SHA-1: f0125d0190120f1d8c9c8c6a66786ca69979a3fd SHA-256: cfb4ebda58de4874ecb40e16b77db1eeb9beb2e8063b6d5b6ba188f3c37bd724
86 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as an image-only lure, typical for phishing or malware distribution, as indicated by the PDF_IMAGE_LURE heuristic. It contains numerous embedded URLs, many pointing to potentially disposable domains, suggesting a link farm designed to obscure the final destination. While no scripts were explicitly extracted, the PDF structure and heuristics strongly suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

Heuristics 5

  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 67 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://changjiujz.com/uploads/files/202109060307547042.pdf In PDF document text
    • https://hoanghaie.com/Images_upload/files/mifezosimaxonamu.pdfIn PDF document text
    • http://www.anaja-inter.org/public/file/doweriguvuzugesogijojudul.pdfIn PDF document text
    • http://eamenfaraz.com/cache/fck_files/file/fazoxunovulij.pdfIn PDF document text
    • https://kalimati.in/userfiles/file/garefi.pdfIn PDF document text
    • http://internationalnetworksolutions.net/files/In PDF document text
    • https://phatgiaolongan.com/upload/ckupload/files/70206553655.pdfIn PDF document text
    • https://highlander-inn.com/assets/userfiles/files/88333424047.pdfIn PDF document text
    • http://slmj8.com/data/userfiles/files/80588104627.pdfIn PDF document text
    • https://lemarko.com/userfiles/file/jumumesudaranenaribibepo.pdfIn PDF document text
    • http://werkkledingverkoop.nl/images/docman/files/felovezogopopivazizusa.pdfIn PDF document text
    • http://badaranquehablar.com/userfiles/files/tumobelugafefed.pdfIn PDF document text
    • https://basundharamart.com/userfiles/file/73919217264.pdfIn PDF document text
    • http://beta-rc.com/upload/files/88178999136.pdfIn PDF document text
    • http://dolinakrzeptowa.pl/public/upload/ckfinder/userfiles/files/52193730794.pdfIn PDF document text
    • https://chiuman-hk.com/images/file/76483685891.pdfIn PDF document text
    • https://bamfieldrental.com/userfiles/file/ponot.pdfIn PDF document text
    • http://snabsz.ru/ckfinder/userfiles/files/soxafo.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613b49bed4948---keligutuwepazakinir.pdfIn PDF document text
    • http://15881588.com/ckupload/files/sulazo.pdfIn PDF document text
    • https://seedomoretravel.com/files/files/62476228601.pdfIn PDF document text
    • http://sevimticaret.net/userfiles/file/72611529435.pdfIn PDF document text
    • http://atrsara.ir/resource/files/84012721208.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=convert+audio+to+mp4+onlinePDF 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_off0000ae8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE8D 10660 bytes
SHA-256: d31965a40a51658d3cedbdd417010d7dbad4daa4de1aacf6b3e78e03a26803c7
font_01_sfnt_off0000c6fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6FC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000df0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF0E 14024 bytes
SHA-256: d8ef0bb0c5ee13ca652dc321509ae013323947dc5fafc6c73f29bfa1f0ac07f3

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