Malicious PDF — malware analysis report

Static analysis result for SHA-256 04c654add838c802…

MALICIOUS

PDF

88.5 KB Created: 2021-09-20 00:05:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: b9e85c3e08db74382251afb7ba8e428c SHA-1: ec8cae63314822e11a037f3e90bc62e1268da3a0 SHA-256: 04c654add838c8026dee584b19105a8c9f6a194be93e7de1e70452164a1aa4ca
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and numerous external URIs, many pointing to disposable domains, indicating a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for exploiting PDF vulnerabilities or redirecting users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://color-gateway.com/userfiles/file/30459697858.pdf In PDF document text
    • http://www.sintsprev-ms.org.br/ckfinder/userfiles/files/68260190447.pdfIn PDF document text
    • http://ebus.cn/up_file/file/37628343100.pdfIn PDF document text
    • https://rhuyscampingcar.fr/images/files/rulovibivoxaluvisifo.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/7dd6edfe5f39f88400a1e6737d2a98e3/75008029284.pdfIn PDF document text
    • http://www.hzkontejnery.cz/ckfinder/userfiles/files/bamipolafodon.pdfIn PDF document text
    • http://morethancars.nl/uploads/edytor/file/14162810158.pdfIn PDF document text
    • http://mbjarrahi.com/UploadedFiles/New/file/nimupaf.pdfIn PDF document text
    • http://1night2day.com/UserFiles/file/52802336111.pdfIn PDF document text
    • https://natatourism.com/userfiles/files/jokifapasoxurag.pdfIn PDF document text
    • http://intertexmedical.com/userfiles/files/47216144699.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613c707d79704---juxiwovefusolit.pdfIn PDF document text
    • https://fanaf.org/article_ressources/file/61091291900.pdfIn PDF document text
    • http://kant21.com/userData/board/file/fabisapejakusurajaj.pdfIn PDF document text
    • https://clickbox.ro/images/file/82950994298.pdfIn PDF document text
    • http://anchor-m.com/js/upload/files/51568623440.pdfIn PDF document text
    • http://lindseyderence.com/userfiles/files/kowametowedofasojopif.pdfIn PDF document text
    • http://vagtteam.dk/userfiles/Files/76476214530.pdfIn PDF document text
    • http://acelybio.com/upload/files/69070045742.pdfIn PDF document text
    • http://webinaris.blog/ckfinder/userfiles/publics/files/11390315370.pdfIn PDF document text
    • http://brandnewgoods.net/userfiles/file/tosaguvogawilarij.pdfIn PDF document text
    • http://chithanhplastics.com/uploads/userfiles/file/ruduremubidigisebe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=wear+os+raspberry+piPDF 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_off0000f461.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF461 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010c78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C78 10244 bytes
SHA-256: d0a02956f120ea5cd324448bf715d24a2081abf893efb916c22fe57275055b1f
font_02_sfnt_off00012362.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12362 18720 bytes
SHA-256: 1e025c35f4b344f3a35d9a267ecd6d4df0acc786db8fcbcc7019944909a8ee8a

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