Malicious PDF — malware analysis report

Static analysis result for SHA-256 74a6efd8e39ed4b1…

MALICIOUS

PDF

72.9 KB Created: 2021-04-01 15:06:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: df06b502aa5a95d606704ff177ad8b86 SHA-1: 866c9153554f0b2a013239ad5ca264aadc0deffa SHA-256: 74a6efd8e39ed4b1d83aec2e8a6dda50d3c1975af6422e16fa39d41a0abbe8a8
186 Risk Score

Malware Insights

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

This PDF file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of external links, many pointing to disposable domains, suggesting a link farm or redirection scheme to host malicious content. The document body, though heavily obfuscated, contains keywords like 'backgammon rules pdf' and references to 'wkhtmltopdf', likely a lure to entice users to click on the embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://resalured.ru/award?keyword=backgammon+rules+pdf PDF link annotation
    • http://hookup671.site/ford_ranger_repair_panelsl3ev3.pdfIn PDF document text
    • https://kipunazumalimak.weebly.com/uploads/1/3/4/7/134755782/pigifeji_mipaxomupew_rajonunetaxev_vipebonu.pdfIn PDF document text
    • https://jiparebifipi.weebly.com/uploads/1/3/4/6/134638028/b1519dc06.pdfIn PDF document text
    • http://tipografiyav.moscow/one_year_after_william_forstchen_epubgoumw.pdfIn PDF document text
    • http://dhl-order.info/1748245604hl6ci.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454303/normal_601a3964f07e6.pdfIn PDF document text
    • http://nitanupemil.mygamesonline.org/xemofab.pdfIn PDF document text
    • https://texifafotolatip.weebly.com/uploads/1/3/4/7/134764930/rigasowixuju.pdfIn PDF document text
    • http://nakozovuzu.22web.org/13472223931.pdfIn PDF document text
    • http://mazisim.mywebcommunity.org/descarga_gratis_biblia_plenitud.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403119/normal_60162bd6d84fd.pdfIn PDF document text
    • https://sezitekiporav.weebly.com/uploads/1/3/4/6/134627959/gosilidisovitezaj.pdfIn PDF document text
    • https://zewemoledomuro.weebly.com/uploads/1/3/4/7/134746436/6481753.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cceb078e-1df6-42b0-9e12-359f30e42f1d.filesusr.com/ugd/e8506d_34fb4e8d3a28476091df874345c66ad8.pdf?index=trueIn PDF document text
    • https://814cba0f-f649-4223-bfe6-7884e6e02b9d.filesusr.com/ugd/c1108c_be04e4b547224c5b89d031144c7c96e0.pdf?index=trueIn PDF document text
    • http://lopejad.epizy.com/cumulative_update_for_windows_10_error.pdfIn PDF document text
    • https://c6926203-1eb9-401e-9afa-11f61f201807.filesusr.com/ugd/685707_0e87bc60bbec48569cf421185d422cfa.pdf?index=trueIn PDF document text
    • http://mirovexul.rf.gd/39321957999.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_off0000e0bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0BF 5588 bytes
SHA-256: c19203bc4df90f105e4abea28f53410c0214ee16de08ab8d984d7930527ac6ca
font_01_sfnt_off0000f3b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3B2 10228 bytes
SHA-256: db3c32156f5bfd5adc224c36f0adc0c8b35f3c4deed359e94bd4a10918e70f15

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