Malicious PDF — malware analysis report

Static analysis result for SHA-256 bddab5acaf8c35bb…

MALICIOUS

PDF

78.7 KB Created: 2021-10-07 16:18:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: b1219ca3ab24f0fd9586befe3f203ce0 SHA-1: f0057b2e6d62fd4b0dab0ddd8a73cf03e0374a27 SHA-256: bddab5acaf8c35bb879cc917d8abcb462c2774454402c51e6084bf93983850e8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate it functions as a link farm, redirecting users through multiple domains, likely for phishing or malware distribution. The presence of numerous external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly suggest this purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 https://catamma.ru/uplcv?utm_term=hold+their+own PDF link annotation
    • http://julianowka.pl/ckfinder/userfiles/files/tatorezutimumofevorem.pdfIn PDF document text
    • http://bioaec.com/userfiles/files/77006159153.pdfIn PDF document text
    • https://actaviaserica.org/board/file/files/25603261662.pdfIn PDF document text
    • https://pharma-tools.pl/galeria/file/58210348105.pdfIn PDF document text
    • https://kolkataangikar.org/ckfinder/userfiles/files/dozajuzubuni.pdfIn PDF document text
    • https://sailstudy.in/ckfinder/userfiles/files/towozifapavevuralojupike.pdfIn PDF document text
    • http://safaraval.com/basefile/safaravalcom/files/wevewapikenudos.pdfIn PDF document text
    • https://webmakler.org/userfiles/file/baxipafa.pdfIn PDF document text
    • http://antopol.topmebli.com/content/xuploadimages/file/16874716382.pdfIn PDF document text
    • http://bagliodeimille.it/userfiles/files/54501847854.pdfIn PDF document text
    • https://12shio4.com/contents/files/43574415736.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/161470fcd4a2d3---sumizuzuvud.pdfIn PDF document text
    • http://unibox.lv/files/text/babidomanaguverudeki.pdfIn PDF document text
    • https://techson-cctv.com/upload/file/gapewedobevizewoweno.pdfIn PDF document text
    • http://kavtas.com/images_upload/files/28293795623.pdfIn PDF document text
    • http://gucaoyun.com/uploads/file/271829446751.pdfIn PDF document text
    • http://gillsandgeckos.com/userfiles/file/fokatinilimi.pdfIn PDF document text
    • http://branonperformance.com/ckfinder/userfiles/files/zazebivatera.pdfIn PDF document text
    • http://schokofontaenen.de/idata/kefagewebixomurofeb.pdfIn PDF document text
    • http://lapmaymn.samdigroup.vn/app/webroot/upload/files/juwirikezasuzader.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/161511bb81d17c---50187561190.pdfIn PDF document text
    • http://siamsnail.com/media/userfiles/files/miwavuvexafezojajuget.pdfIn PDF document text
    • http://csc025.com/userfiles/file/20210923095813_h9t6og.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_off0000d433.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD433 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ec4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC4A 10092 bytes
SHA-256: b94f74d2f142f3721e386837e9635d6907fcaee4caad9855ab752040cee7877f
font_02_sfnt_off000102a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102A2 16448 bytes
SHA-256: e97e46734d958f75d3bb921c56df98247009a9c74fac03826f5fa83b45450e4b

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