Malicious PDF — malware analysis report

Static analysis result for SHA-256 2fae658ac8db09c8…

MALICIOUS

PDF

76.0 KB Created: 2021-09-13 18:37:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 30929de48fea5ada93d6d780d8d507b9 SHA-1: 1962d2b4fa25e02a07979b1b710d6671595ea35b SHA-256: 2fae658ac8db09c89c8bc9ca41134f6fa1e974c5c2d6db16f8001456225a1637
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a machine learning model and ClamAV, indicating malicious content. It contains numerous embedded URLs pointing to disposable domains and link farms, suggesting a phishing or malware distribution scheme. The presence of external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly indicate an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://pixomot.ru/uplcv?utm_term=david+dobrik+disposable+camera+app+android+download
    • http://bxbrdh.marketsearching.com/upload/files/maviwozoraretejerekidika.pdf
    • http://www.sloepverhuur-debiesbosch.nl/upload/files/10043190402.pdf
    • https://seo-methodes.com/userfiles/file/zojefasadavejipuke.pdf
    • http://pantipplaza.com/userfiles/file/fubizutufebuzomizodogesu.pdf
    • http://www.mueblesgamez.com/ckfinder/userfiles/files/vejanonaxulerisimamurapo.pdf
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ebee762a37---fibosobajakagol.pdf
    • http://ekhoron21.mn/uploads/files/rokezeribubaxija.pdf
    • https://hsiaoying.com/userfiles/file/66266325992.pdf
    • https://hamayeshniroo.com/shop/file/mesev.pdf
    • http://www.cbs-emballages.com/upload/file/52100828541.pdf
    • http://www.hkrns.org.hk/ckfinder/userfiles/files/41641861820.pdf
    • http://uniquehotelsolutions.com/files/others/73308828266.pdf
    • http://preiss.at/upload_files/files/20579213158.pdf
    • https://agermag.ro/mm/file/26905118079.pdf
    • http://seamcc.com/UserFiles/files/75172097956.pdf
    • http://greddy.com/admin/common/ckfinder/userfiles/File/likesirizutozu.pdf
    • http://mlead.net/images/e/file/dirifoz.pdf
    • http://drsrkbedcollege.com/ckeditor/ckfinder/userfiles/files/10120855501.pdf
    • http://cn-biyoute.com/d/files/tutebovevulirokazabo.pdf
    • http://ersatzmonitor.de/userfiles/file/54014740066.pdf
    • https://stdtekstil.com/upload/ckfinder/files/kedexewifuf.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_off0000c36f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC36F 16792 bytes
font_01_sfnt_off0000db81.bin
7b3937562a51516b220949727f51fff9f20bc5ebbf13c3a9cecfaafc1c060a72		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDB81 17532 bytes
font_02_sfnt_off000108fb.bin
6e23ec1e0c91fd7a90dbf084b639c6911ad8f4fad773476bf2f952c633eaeffb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x108FB 10960 bytes

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