Malicious PDF — malware analysis report

Static analysis result for SHA-256 be24efa8519b7cef…

MALICIOUS

PDF

78.6 KB Created: 2021-06-07 11:53:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c9ae491b525c003742bf1767ab804064 SHA-1: 65d5eb7231956f1a95c07985a3bcc08bf7c08506 SHA-256: be24efa8519b7cefcfc76ef1a78c08b8a53e270d76137223a601f5979b3ee16b
156 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 Weebly-hosted PDFs, suggesting a link farm designed to distribute malware or engage in phishing. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and extensive link farm are indicative of a downloader or phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/123?utm_term=landscape+ecology+pdf+book
    • https://libakitaxejadeg.weebly.com/uploads/1/3/4/0/134096258/1cabb08e224097.pdf
    • https://ximakidanilesub.weebly.com/uploads/1/3/5/3/135301756/povidavelugib.pdf
    • https://vuvowopivuvi.weebly.com/uploads/1/3/1/4/131410126/fekarutija.pdf
    • https://bumogekatagod.weebly.com/uploads/1/3/0/7/130776321/e733465f.pdf
    • https://rewajugelawuz.weebly.com/uploads/1/3/0/7/130738764/sivofexanef-leweviw-rudilozusar.pdf
    • https://kusejibetejoxer.weebly.com/uploads/1/3/4/7/134749151/7422916369.pdf
    • https://cdn-cms.f-static.net/uploads/4414687/normal_6051543a12295.pdf
    • https://cdn-cms.f-static.net/uploads/4495696/normal_60200348db3f3.pdf
    • https://nipixejewawowe.weebly.com/uploads/1/3/0/8/130874539/bemumeviperulezusa.pdf
    • https://jinepitabo.weebly.com/uploads/1/3/7/5/137515198/7030746.pdf
    • https://cdn-cms.f-static.net/uploads/4505839/normal_605f9f065f6dc.pdf
    • https://kupelaranix.weebly.com/uploads/1/3/4/7/134729830/5134492.pdf
    • https://cdn-cms.f-static.net/uploads/4462075/normal_603ff821f24c4.pdf
    • https://lifovidas.weebly.com/uploads/1/3/1/8/131856672/manezuxisoji-kogasumu-lipoduva.pdf
    • https://zuwuroxiver.weebly.com/uploads/1/3/1/0/131070979/627995874179.pdf
    • https://cdn-cms.f-static.net/uploads/4484624/normal_602f3ad4be688.pdf
    • https://mevimozow.weebly.com/uploads/1/3/0/7/130776561/sigesopem.pdf
    • https://cdn-cms.f-static.net/uploads/4478664/normal_6064e8346d41c.pdf
    • https://cdn-cms.f-static.net/uploads/4531523/normal_6068d2e365013.pdf
    • https://cdn-cms.f-static.net/uploads/4415739/normal_6016c29e6c2e8.pdf
    • https://cdn-cms.f-static.net/uploads/4409826/normal_600c373479ef8.pdf
    • https://denelabi.weebly.com/uploads/1/3/4/1/134109088/174cd7aa1.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://pajinap.pbworks.com/w/file/fetch/144498501/zozuridiburop.pdf
    • http://nomebazeregi.pbworks.com/w/file/fetch/144760635/53092678924.pdf
    • http://vejivab.pbworks.com/f/exercice_amplificateur_oprationnel.pdf
    • http://tovemubu.pbworks.com/w/file/fetch/144586155/rujazewiliwezosurov.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f53b.bin
5cf09e7c2505e3eebdc74ee64c525aa8243b42c2298af2cc4d6c687b21c2e7e7
pdf-font-stream PDF embedded font (sfnt) at offset 0xF53B 5472 bytes
font_01_sfnt_off00010802.bin
ff478ad6b32c4955af64b3be655235ce3a48543214acbf71418bc254c98f200a
pdf-font-stream PDF embedded font (sfnt) at offset 0x10802 10948 bytes