Malicious PDF — malware analysis report

Static analysis result for SHA-256 76bfb55eea5e6612…

MALICIOUS

PDF

83.0 KB Created: 2020-12-31 07:02:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: dcc27cd928dd4205a937d8210e6bddb0 SHA-1: 9d67a7f413f27d9d52f5533b052571062b89e3eb SHA-256: 76bfb55eea5e66126d52ef9254e18b32f60fa7034b73137b3a61a5ca16edf301
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm used for SEO manipulation or to distribute malicious content. One of the extracted URLs, 'https://trafffi.ru/123?utm_term=yugioh+duel+links+apk+mod+2020', is particularly suspicious and likely leads to a phishing or malware download site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://trafffi.ru/123?utm_term=yugioh+duel+links+apk+mod+2020 PDF link annotation
    • https://belinadojo.weebly.com/uploads/1/3/1/6/131607131/5603d1bf6a6.pdfIn PDF document text
    • https://taxajoberaruvu.weebly.com/uploads/1/3/4/3/134320235/ce8b834a212.pdfIn PDF document text
    • https://cdn.sqhk.co/regavebike/t2hjgf9/the_chosen_one_season_1_cast.pdfIn PDF document text
    • https://namosupegu.weebly.com/uploads/1/3/4/3/134313644/3171256.pdfIn PDF document text
    • https://cdn.sqhk.co/pasepizut/jbhaThe/skylands_medical_group.pdfIn PDF document text
    • https://cdn.sqhk.co/baxemazisod/ggXTx1Z/switch_pros_mount_tray.pdfIn PDF document text
    • https://muwegejise.weebly.com/uploads/1/3/4/2/134265646/4104871.pdfIn PDF document text
    • https://cdn.sqhk.co/pimidima/jggRjaS/72471686749.pdfIn PDF document text
    • https://pexafibilo.weebly.com/uploads/1/3/4/4/134484824/mopone.pdfIn PDF document text
    • https://cdn.sqhk.co/visukodo/PghDbhj/linokusefapowolep.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • https://uploads.strikinglycdn.com/files/1d97ce52-4585-413b-a217-f5a9a6765aa1/whirlpool_cabrio_dryer_service_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/817d1992-b022-458e-b3d0-8f09cd2d308f/stockcharts_predefined_scans.pdfIn PDF document text
    • https://s3.amazonaws.com/tokit/dozuki.pdfIn PDF document text
    • https://s3.amazonaws.com/xezonijida/study_island_answers_math_7th_grade.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://scripts.sil.org/OFLIn PDF document text
    • http://www.gnu.org/licenses/gpl.htmlIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF8A 5576 bytes
SHA-256: 911b86824d63c214cf68ddd0aab2dd65e3e58485d38675bc5e326eb70ebe8c5d
font_01_sfnt_off00010257.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10257 6792 bytes
SHA-256: beec4a0cb8586055fa2e860d4f413243622d5188023ee72c2076c8e778b1e1b4
font_02_sfnt_off00011473.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11473 12348 bytes
SHA-256: 2e4f40039966ebfe7db5712ab048c73df8a5176033c36dc5af584f276eb25378

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