Malicious PDF — malware analysis report

Static analysis result for SHA-256 598720145ecf5ab8…

MALICIOUS

PDF

74.2 KB Created: 2021-01-12 17:44:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: e60f2ea4d02c614eb54344abeeae8544 SHA-1: d90de974ec1d48b90e9a6008ac74e686c49c71d2 SHA-256: 598720145ecf5ab8e44c61d5ff94891fe7a3c4f2102cf737a0db56d000892c67
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file contains a large number of external links, identified as a link farm, with one URL pointing to 'traffset.ru'. The ClamAV detection and ML classifier strongly indicate maliciousness, likely related to phishing or SEO spam. Although no scripts were explicitly extracted, the PDF structure and numerous external links suggest an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://traffset.ru/123?utm_term=new+google+page PDF link annotation
    • https://cdn.sqhk.co/nuroteditu/5uso4r1/shudder_movie_app_review.pdfIn PDF document text
    • https://site-1174179.mozfiles.com/files/1174179/magic_tiles_3_hardest_song.pdfIn PDF document text
    • https://site-1168401.mozfiles.com/files/1168401/45954469607.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459805/normal_5fe6188f344a7.pdfIn PDF document text
    • https://zajefepitav.weebly.com/uploads/1/3/4/2/134266194/9217438.pdfIn PDF document text
    • https://kusavavatixe.weebly.com/uploads/1/3/4/8/134878613/9336457.pdfIn PDF document text
    • https://site-1173903.mozfiles.com/files/1173903/extreme_landings_pro_free_download_apk.pdfIn PDF document text
    • https://vopevejefed.weebly.com/uploads/1/3/1/6/131606133/widipumov.pdfIn PDF document text
    • https://site-1083678.mozfiles.com/files/1083678/space_frontier_2_mod_apk_unlimited_money.pdfIn PDF document text
    • https://site-1176223.mozfiles.com/files/1176223/merge_snake_mod_apk_download.pdfIn PDF document text
    • https://nenafefetu.weebly.com/uploads/1/3/1/4/131406263/3475568.pdfIn PDF document text
    • https://mepifinifiwiza.weebly.com/uploads/1/3/4/3/134334375/goxetebubov-tononi.pdfIn PDF document text
    • https://site-1176262.mozfiles.com/files/1176262/96928834698.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC2D 4328 bytes
SHA-256: 562547547297a69b09f3ae2930fa3d1fb0c6166c20ee504831c619441d32a873
font_01_sfnt_off0000eafc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAFC 10316 bytes
SHA-256: e6dd5b15ceca44172942bfa0cbc226c53d4b689e1fe0e57db146cbc68d072fb0
font_02_sfnt_off00010e57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E57 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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