Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0004be6c0886edb…

MALICIOUS

PDF

69.4 KB Created: 2021-09-27 22:52:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3ea9f410070a88db1cda7af32f8821ed SHA-1: 99b8b70299195750d5d979ffbd17b76a4fd8db95 SHA-256: f0004be6c0886edb817260736a4c0112670ca7d85b1ca313ebbee7ca80907e2a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of numerous external URIs, particularly those pointing to link farms and disposable hosting, suggests a phishing or SEO manipulation scheme. Although no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pistant.ru/uplcv?utm_term=php+and+mysql+web+development+pdf+free+download
    • https://mollis.rs/files/rininawobamozonasavefik.pdf
    • http://www.psychophonie-tarbes.com/ckfinder/userfiles/files/xemigofesiruvajosepuvu.pdf
    • https://mimpishiodua.com/contents/files/fokibadajifiref.pdf
    • https://www.suep.gr/ckfinder/userfiles/files/xolisufatikik.pdf
    • http://kliknetezde.cz/admin/obrazky/file/12792806077.pdf
    • https://777mto.info/contents/files/82229608075.pdf
    • http://disonde.com/filespath/files/20210927151730.pdf
    • http://rc-modeller.se/images/file///14017983168.pdf
    • https://netcsemege.elelmiszer-hazhozszallitas.hu/ckfinder/userfiles/files/54933968748.pdf
    • https://cauthinh.com/luutru/files/19780359698.pdf
    • https://intrastorg.com/userfiles/file/95116774007.pdf
    • https://bor-diing.com/upload/files/66131546508.pdf
    • http://www.ciesol.com/ckfinder/userfiles/files/kilovupulurug.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161302c982d6ab---90494096565.pdf
    • https://globalmediaminds.com/uploads/files/nebixidolub.pdf
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/161340f3feb5dd---kutosuwixikifipinamazap.pdf
    • http://dycelife.com/userfiles/file/64203184907.pdf
    • http://arsvet.ru/img/upload/9099363796.pdf
    • http://zoscm.zohukum.com/ckfinder/userfiles/files/41432704414.pdf
    • https://cmoretv.com/userfiles/radapajunesonewowuzowipug.pdf
    • http://yepuco.com/uploads/files/85386616590.pdf
    • http://vnndt.com/Images_upload/files/48098129566.pdf
    • https://legouic-peinture.fr/userfiles/file/52849265263.pdf
    • https://izyskately.ru/foto/ck/files/26448398034.pdf
    • http://galenbio.com/images/upload/file/vonugekegufu.pdf
    • http://www.asiacoservice.com/file/files/zegufojaxifatap.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b0fa.bin
afa3b7e4da10ce0fe14f97b4999695a768e8982bb256d9ebec86b7b1a482a059		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB0FA 11224 bytes
font_01_sfnt_off0000cabe.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCABE 16792 bytes
font_02_sfnt_off0000e2d0.bin
9aeff38c87e69ec98e4921af179ffb34519dae1d71ce7c2bee8f7825d6176199		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE2D0 14604 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.