Malicious PDF — malware analysis report

Static analysis result for SHA-256 413182ed958a8f9e…

MALICIOUS

PDF

74.9 KB Created: 2021-04-09 21:30:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 13901ca03a671f54ce3174859c30a19e SHA-1: a64874239a6ebf6f30682e2f517b77ee78a42ab8 SHA-256: 413182ed958a8f9ea714b9027f473e5449921366abc67d3380fd6b91e51eb98e
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains, indicating a link farm designed to potentially lead users to malicious content or phishing sites. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the PDF structure itself is indicative of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 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://ponafet.ru/strik?utm_term=what+is+computer+science+and+programming PDF link annotation
    • https://cdn.sqhk.co/xataruzepape/jyjbhcF/wilhelm_scream_origin_female.pdfIn PDF document text
    • https://cdn.sqhk.co/xukeposudexo/fhh0STw/86858747246.pdfIn PDF document text
    • https://cdn.sqhk.co/fenazijeguk/jggfPtJ/wejerebiwunuvobufututilez.pdfIn PDF document text
    • https://cdn.sqhk.co/junikesiza/ThjuClM/converting_fractions_to_decimals_worksheets_grade_6.pdfIn PDF document text
    • https://cdn.sqhk.co/devisojop/KoheZhe/vodaxufekuvusujoxaz.pdfIn PDF document text
    • https://cdn.sqhk.co/faxiwapa/A2jclzs/xejabozivokuwebuxamiv.pdfIn PDF document text
    • https://cdn.sqhk.co/rinugezig/Ejbjggi/dogotopemenofamagowan.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/fuvidokibet/never_back_down_stronger_lyrics.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6f5bfe02-706e-49eb-ae9f-5f299d58d49a/whats_fords_slogan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/428ae018-4376-41ee-97d9-a8c6f84c82f1/senafad.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/400b324b-dab2-43de-ac76-911fc88129be/linksys_router_wrt110_setup.pdfIn PDF document text
    • https://e8dc5420-792a-4861-90db-09cfc8d8a7d1.filesusr.com/ugd/1378f5_06b2db991f82472691f86441e9ae7290.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vovabagubajegeb/93762496668.pdfIn PDF document text
    • https://018ae6bf-5b6e-4bf7-bb5f-89503284f855.filesusr.com/ugd/b7931c_5367e50ebd2d488cbc46ba59febb63fb.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8f897855-68a7-4fd6-b183-becbccfb1795/67617620187.pdfIn PDF document text
    • https://s3.amazonaws.com/nakuzafol/gatumiforizigokijivotede.pdfIn PDF document text
    • https://f84ffea9-2755-49c2-9cb5-47ca8b55fe65.filesusr.com/ugd/0adedf_5b8ba31a7e1141ca8f89c6f55490bcbd.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/04976dc0-d415-4f44-80a7-cc009b3322c9/introduction_to_management_accounting_16th_edition.pdfIn PDF document text
    • https://s3.amazonaws.com/lezopobigeza/how_to_setup_genie_remote_control.pdfIn PDF document text
    • https://s3.amazonaws.com/memobofilenabon/what_is_acura_b16_service.pdfIn PDF document text
    • http://zigemevopowab.epizy.com/lalejulajilexebojatura.pdfIn PDF document text
    • http://forolulazo.rf.gd/kavya_ajit_ambalapuzha_song.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e58c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE58C 5468 bytes
SHA-256: 73f138ac46274a337f5e76fe64d62c6d225e055f780b869953a0a603a8799e5c
font_01_sfnt_off0000f801.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF801 11396 bytes
SHA-256: b7bf9eb4a922460d9cc9b86526611c208b565af25d78da369af3dd01cf0414d0