Malicious PDF — malware analysis report

Static analysis result for SHA-256 82ecaa611ab3d727…

MALICIOUS

PDF

72.9 KB Created: 2021-09-21 02:47:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 844412d91ee3c87d7e3cbf597e7f8ca9 SHA-1: c6887462233f55c1ccca591ff45745df796c4129 SHA-256: 82ecaa611ab3d727d3d0cc46113f3cf953e3a6f8a62b5ba1c8f235912373c4dc
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a high number of external URIs, many of which are hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for exploiting PDF vulnerabilities or redirecting users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://medvor.ru/uplcv?utm_term=gta+3+vehicle+cheat+codes PDF link annotation
    • http://ecosdaliberdade.com/ckfinder/userfiles/files/61049262172.pdfIn PDF document text
    • http://www.hausbaumesse.at/ckfinder/userfiles/files/jiporumewolosodunabu.pdfIn PDF document text
    • https://ladangmimpi2.com/contents/files/70085091343.pdfIn PDF document text
    • http://mamtomchabahai.com/uploads/files/files/nosetufinen.pdfIn PDF document text
    • https://u-spot.biz/js/ckfinder/userfiles/files/16555964452.pdfIn PDF document text
    • https://mr-alian.com/upload/ckfinder/files/fatowawigoxinetobame.pdfIn PDF document text
    • https://www.jakketoes.be/ckfinder/userfiles/files/pewojupatosorekivowosap.pdfIn PDF document text
    • http://iccj.jp/images/uploads/fckeditor/file/tewawaza.pdfIn PDF document text
    • http://effektfilm.de/files/file/lajuwafesepur.pdfIn PDF document text
    • https://izr.fr/files/ladamukeke.pdfIn PDF document text
    • http://www.mueblesgamez.com/ckfinder/userfiles/files/pozaxalulanaz.pdfIn PDF document text
    • https://www.hosotte.com/ckfinder/userfiles/files/43388145859.pdfIn PDF document text
    • http://luchetti.it/userfiles/files/16655948760.pdfIn PDF document text
    • https://kristaldicarlo.com/userfiles/file/garejuxep.pdfIn PDF document text
    • http://machinegroup.ru/img/outer/files/riregetikojojosexamoti.pdfIn PDF document text
    • http://kimsanghun.com/upload/userfiles/file/2021971413587233.pdfIn PDF document text
    • https://sanipacific.com/attachment/file/serekaw.pdfIn PDF document text
    • http://kingswaytyres.com/project/kingsway/uploads/file/nunavunitoduroxag.pdfIn PDF document text
    • http://fqcycpa.com/jingkelun/userfiles/files/20210912175336.pdfIn PDF document text
    • http://cbestdesign.com/ckfinder/images_store/files/korikerivoso.pdfIn PDF document text
    • https://pfollowers.com/ci/userfiles/files/tewogizawimerusikika.pdfIn PDF document text
    • http://bunny888.com/ckfinder/userfiles/files/35813045109.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_off0000b8ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8CE 17524 bytes
SHA-256: 9569d1c85dbcd2d9cbacfec2452de2a3af385cbdbd1edb4bf91b25c5def3d0d3
font_01_sfnt_off0000e621.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE621 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fe38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE38 10540 bytes
SHA-256: b69aee0f7b650e4e1084bc81cfaf9689a03c17bd21ef16ad5f59feedcb67776b

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