Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ffee197a60eb7ca…

MALICIOUS

PDF

79.3 KB Created: 2021-04-27 04:44:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 027efbb8ebfbfe2e225cc3d3b95db9e8 SHA-1: 22763605a203abee30dd27f65c91d807b94860bb SHA-256: 4ffee197a60eb7cafffef74bf1ec50deccd6602a1f81d6e7e1f13cabdd961d86
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a machine learning classifier and ClamAV, indicating it is likely a phishing or malware distribution lure. The presence of numerous external URIs, many hosted on disposable domains, suggests a link farm designed to redirect users to malicious content. Although no scripts were explicitly extracted, the PDF structure and embedded URIs point towards an attack pattern involving redirection to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • 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 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://nipisod.ru/strik?utm_term=artemis+fowl+the+arctic+incident+cover PDF link annotation
    • http://psychologyrelax.xyz/samsung_remote_not_working_red_light_flashingfxvot.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488346/normal_5fd7b58217460.pdfIn PDF document text
    • http://vonezejavej.22web.org/baritone_uke_chord_chart.pdfIn PDF document text
    • http://marifivelaj.mygamesonline.org/adaptive_reuse_extending_the_lives_of_buildings.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368503/normal_603f4310606cd.pdfIn PDF document text
    • http://foyou.store/727365432834fxrc.pdfIn PDF document text
    • http://pibosezegis.22web.org/25037758004.pdfIn PDF document text
    • http://sutovuresas.mygamesonline.org/ccdc_22.pdfIn PDF document text
    • http://rexonina.medianewsonline.com/bovakugijevaval.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496380/normal_5fcd56f95a813.pdfIn PDF document text
    • http://potenciy.xyz/sibubunufarukoii7dp.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448337/normal_5fe1210deaf59.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491168/normal_6056d33bc62c9.pdfIn PDF document text
    • http://znohist.site/44505033530dna7w.pdfIn PDF document text
    • http://yesnutural.space/dikutafikoji0dpxh.pdfIn PDF document text
    • http://soribowunalosu.22web.org/3588845453.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://ab60d57a-1f92-408f-9079-0b325776b613.filesusr.com/ugd/724fb5_f7787c5172cf4009ba056207bebebe99.pdf?index=trueIn PDF document text
    • https://b73b9701-b1df-43be-b031-73419f87697c.filesusr.com/ugd/bfbd96_57e18f6882304a9dbaa50360c14da8a9.pdf?index=trueIn PDF document text
    • http://xugemogi.epizy.com/ganoderma_lucidum_benefits.pdfIn PDF document text
    • https://ce099f17-eb12-430b-a452-8d789b3ee5a8.filesusr.com/ugd/aef5b7_a8d110100caa4dd8bd57edc118815b07.pdf?index=trueIn PDF document text
    • http://rawelusovonifax.epizy.com/34702799758.pdfIn PDF document text
    • http://kegaregajisojas.rf.gd/fevidefagusiwelibavikunu.pdfIn PDF document text
    • http://gexegufikide.epizy.com/witok.pdfIn PDF document text
    • https://425e2ee7-996f-4c6d-a593-b44a2a39b733.filesusr.com/ugd/bb05c1_86be0fed94b74ba981e7566ff25eaa62.pdf?index=trueIn PDF document text
    • https://288dffde-0386-48bd-adba-b069b5f3b70f.filesusr.com/ugd/7e1b39_3113ced33c6244ca832462e5ba2f6817.pdf?index=trueIn 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_off0000f88c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF88C 5400 bytes
SHA-256: d2fbe109d4821306c61d12cce1bd5946cafe14039049796f097ae2719fe44b84
font_01_sfnt_off00010ad1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AD1 10812 bytes
SHA-256: 8480e0d6a68a69fc7ba9ca30adeafc14b257687f874300a373846906dddc7e83