Malicious PDF — malware analysis report

Static analysis result for SHA-256 16cc3711fe144295…

MALICIOUS

PDF

74.6 KB Created: 2020-12-18 15:47:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 82b1bd61cd09873523c22727ff5aa682 SHA-1: 134392a7bbc37d553bed6adb8aa4b79f3b085062 SHA-256: 16cc3711fe144295ecd43324dd0f6e65cd5656c4494839c30d1928f9dd92be81
214 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, with one identified as a malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded links suggest a phishing or malware distribution campaign, likely initiated via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://gettraff.ru/strik?utm_term=hunter+academic+calendar+2018-19+uk
    • https://dajilifu.weebly.com/uploads/1/3/4/8/134891154/7507267.pdf
    • https://sisaseno.weebly.com/uploads/1/3/0/7/130776680/9458292.pdf
    • https://cdn-cms.f-static.net/uploads/4373008/normal_5f8d71881450d.pdf
    • https://zovarufegurer.weebly.com/uploads/1/3/4/6/134625168/tiwowitisanetopenef.pdf
    • https://zixatemanareku.weebly.com/uploads/1/3/4/4/134472678/7056556.pdf
    • https://kuzogirig.weebly.com/uploads/1/3/4/7/134748708/c4e33.pdf
    • https://digokevun.weebly.com/uploads/1/3/4/7/134747151/5d832c8cc.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/a6c4eb62-81f9-411a-8fc1-374141530c9a/takefewubowiveganoba.pdf
    • https://uploads.strikinglycdn.com/files/261096f8-c301-4073-9703-c8d29692fa7e/gebepudikin.pdf
    • https://static1.squarespace.com/static/5fc37032d26ff1194f83f2a8/t/5fcc772224c49707d3182635/1607235386872/fugovuna.pdf
    • https://uploads.strikinglycdn.com/files/07564988-b2c2-4bba-b5d1-244200dca5c2/53281289636.pdf
    • https://uploads.strikinglycdn.com/files/3740cd62-290f-461a-9da4-41bbbeaebebc/terepewazorevuzadasufizak.pdf
    • https://uploads.strikinglycdn.com/files/23ea810b-0b7d-4617-bec5-0f1989a2e5df/molizigodesugivajuziba.pdf
    • https://uploads.strikinglycdn.com/files/3a50df7b-092d-4840-8df8-cd0c16f1a356/toastmasters_humorous_speech_evaluation_form.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_off0000e271.bin
13fd0ec8b79b4b2eb60cbf21af00072e9e23b87867bb368a33c708e02b2a98fd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE271 5640 bytes
font_01_sfnt_off0000f589.bin
6b5d0aedf49d53cbbb585b26d761855231d27b947897cc5e6de1616b9cba6677		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF589 12780 bytes

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