Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d0bb30b19654b8b…

MALICIOUS

PDF

67.8 KB Created: 2021-03-29 20:08:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: af43d438483e5ec629435773c09da134 SHA-1: ef1c57cec3ae3867c7da0b6262059a9ee21f9f07 SHA-256: 5d0bb30b19654b8bd38b131fc71f5ad41cc50aea82c5b59a3be04e14c8a8f35f
164 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicated a high probability of maliciousness. It contains numerous external links, suggesting a link farm or redirection mechanism to host malicious content. The presence of a 'download button' heuristic further supports a lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://jumiwimov.ru/award?keyword=catherine+millet+pdf+download
    • https://kebuwusatame.weebly.com/uploads/1/3/5/3/135343151/kawosaj-pudoriz-levodajovide.pdf
    • https://dodanopo.weebly.com/uploads/1/3/1/4/131408738/4018042.pdf
    • https://woxamaxepid.weebly.com/uploads/1/3/0/7/130776503/0a790.pdf
    • https://cdn.sqhk.co/mejabutumu/BCghhif/geometry_dash_world_level_10.pdf
    • https://lopatitegadusi.weebly.com/uploads/1/3/5/3/135311006/791157.pdf
    • https://jebasiju.weebly.com/uploads/1/3/1/3/131381450/xonilezuwesexu.pdf
    • https://texifafotolatip.weebly.com/uploads/1/3/4/7/134764930/zubagepalu.pdf
    • https://cdn-cms.f-static.net/uploads/4505837/normal_6049142e11ca2.pdf
    • https://jogemubo.weebly.com/uploads/1/3/4/3/134321321/logukunesida-geninu-mebig.pdf
    • https://static.s123-cdn-static.com/uploads/4454673/normal_5ffbc40c552a8.pdf
    • https://cdn-cms.f-static.net/uploads/4391634/normal_600c8b69ec882.pdf
    • https://cdn-cms.f-static.net/uploads/4502511/normal_602a20d9c2b38.pdf
    • https://cdn.sqhk.co/mumaxifup/iNeJgjs/go_kart_racing_near_me_outdoor.pdf
    • https://cdn.sqhk.co/negixakozaxu/j1jvihp/amazing_facts_in_the_world.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/df8af468-6ff2-479d-857a-ccb3525d71bc/what_is_the_most_accurate_bible_translation_jeopardy.pdf
    • https://c6f55193-7475-4343-97dd-33cb3b141b6a.filesusr.com/ugd/808d8c_dc9858f197c4487384b527458fd735c3.pdf?index=true
    • https://d19688e0-347f-4d9d-8cb3-d47c6e049f3d.filesusr.com/ugd/c618e9_1f2e27d58abc45a095f84ca39ea22b6b.pdf?index=true
    • https://cee4a208-09ac-40e0-983f-4c2cc776acbe.filesusr.com/ugd/5ed537_700d8d325b9e4aae9e7a9c5765c088f7.pdf?index=true
    • https://uploads.strikinglycdn.com/files/0e89d29b-dc9b-4bcd-99e2-ff1923028668/what_anesthesia_is_used_for_oral_surgery.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_off0000cf1a.bin
ab02c7576b0a223200c0fecd8972bf039fb1897cc7d753c81ceb58c94adb0059		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCF1A 5100 bytes
font_01_sfnt_off0000e054.bin
b8970f0f93f4c1e1767a2f3db08b24d8b75896638a6b9352585802bd24c7b11a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE054 9924 bytes

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