Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f4340325dc7695f…

MALICIOUS

PDF

69.5 KB Created: 2020-12-05 09:32:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1f26b2d55d72485d7943826007b6ae62 SHA-1: 780bc59fc8292539cc849c00aa448c3e7c4309bc SHA-256: 0f4340325dc7695f5e329ee841422905576e9e0b346217277def88be1d656cdc
214 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains embedded links that redirect to known malicious infrastructure and a link farm, indicating a phishing or malware distribution attempt. The heuristic firings, particularly 'PDF_MALICIOUS_REDIRECTOR_LINK' and 'PDF_SEO_LINK_FARM', strongly suggest this malicious intent. The ClamAV detection and ML classifier further corroborate the malicious nature of the file, likely exploiting PDF vulnerabilities to redirect the user.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://cctraff.ru/123?utm_term=watch+spider+man+homecoming+free+online
    • https://sijaxidav.weebly.com/uploads/1/3/4/4/134499987/bozilibanopidig.pdf
    • https://xorexataziz.weebly.com/uploads/1/3/4/4/134496469/3833828.pdf
    • https://static.s123-cdn-static.com/uploads/4470979/normal_5fca16de52461.pdf
    • https://kivuligob.weebly.com/uploads/1/3/0/8/130874143/9df728157.pdf
    • https://serawododi.weebly.com/uploads/1/3/4/8/134885696/tolutibemuzega-japik.pdf
    • https://semufevesi.weebly.com/uploads/1/3/4/7/134733881/piwojuso.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static1.squarespace.com/static/5fc0cc6dc14dfd36fef0f123/t/5fc184ff3c6ccf69f3978e05/1606518016139/24353411983.pdf
    • https://static1.squarespace.com/static/5fc0ba3b0a2757459be1f9cb/t/5fc277fc5147b1480482b870/1606580221802/17051424574.pdf
    • https://static1.squarespace.com/static/5fc37eeb104edf1d779169b0/t/5fc7007d1d106d256bb80446/1606877310518/medieval_warfare_magazine.pdf
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbcf26bd334513fae4111c2/1606218347833/xokuxifelorepenubapefewu.pdf
    • https://static1.squarespace.com/static/5fc59a85bf71053ccb2fa840/t/5fc878e3217b3604edddb207/1606973669638/trucker_real_wheels_simulator_unlimited_money.pdf
    • https://static1.squarespace.com/static/5fc5696860f2895dc1061537/t/5fcb05521ef6d1662fe77cfc/1607140690259/rixegiwadid.pdf
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf5e4e4f98375720d7d98e/1606377039522/6153137485.pdf
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbe29ec2dd96f5918b8274b/1606298093062/air_america_pilots.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_off0000d1ff.bin
eb091a92b661caf88d31e7d89f6c40b6a77cd6854da1b97b927ac88d4b62052b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD1FF 5580 bytes
font_01_sfnt_off0000e4da.bin
c5bac12c60ea962d9cbe57281cb999e351648ecaf5a9fb6d0a570006fb69f9ba		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE4DA 10736 bytes

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