Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e5c5d88b3368acb…

MALICIOUS

PDF

97.0 KB Created: 2021-03-31 20:15:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fff0d8b61213b3e5eb00f33e4a03a229 SHA-1: 809bef58bac8abbfa547caeb49633b248557bfef SHA-256: 3e5c5d88b3368acb56537aa6acd7470d7f47c3ec2b512888c2e75c9972c7e62f
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 of which are dynamically generated and point to potentially malicious content, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or SEO spam campaign designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://bologen.ru/wix?keyword=employee+release+letter+sample+from+a+company
    • http://freud.icu/jazz_chord_progressions_piano_bookvx4fm.pdf
    • https://cdn.sqhk.co/vozaxodep/ohjijQg/pilumerevomoletuzavefit.pdf
    • http://siankaanmexico.com/prince2_agile_foundation2kjy9.pdf
    • https://cdn.sqhk.co/xijogedobu/0DhjihW/woodworking_shows_2020_california.pdf
    • http://reduslim-shopofficial.site/performance_appraisal_definition_in_tamil39pg8.pdf
    • http://vawadofofasip.getenjoyment.net/analogies_middle_school.pdf
    • https://cdn.sqhk.co/joraxeneli/cWjhfE9/kuwizoxobobiwifipa.pdf
    • https://cdn.sqhk.co/subilikiwi/gjgf3ja/72141302701.pdf
    • http://esportzmlevent.com/27072138493s1gwt.pdf
    • http://zexejodubaxiku.mygamesonline.org/41393110489.pdf
    • https://cdn.sqhk.co/fosigigamef/3ybBEjd/smashed_potatoes_recipe_pioneer_woman.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://11627308-8c8f-4f08-99ed-0ad85160907d.filesusr.com/ugd/682d1c_4f870e498961400887b18429b0adf50a.pdf?index=true
    • https://uploads.strikinglycdn.com/files/49e151d8-7072-4350-afeb-9d87d79876f2/penny_stocks_to_buy_right_now_2019.pdf
    • https://uploads.strikinglycdn.com/files/33b08bb1-ac13-4c13-b091-00f9c72e126a/ipod_30gb_user_manual.pdf
    • https://uploads.strikinglycdn.com/files/42c3975e-b7de-4f4e-a0c8-374b2206c8bd/bless_me_ultima_essay.pdf
    • https://2f2ab42d-e0b4-4bd3-aa50-2430da1ff5fc.filesusr.com/ugd/eaf48f_e36cd50dfd18488a85c60254140d764d.pdf?index=true
    • https://uploads.strikinglycdn.com/files/7823ccc7-74e7-4a0d-acd1-bb9390fc9ea2/dejazode.pdf
    • https://uploads.strikinglycdn.com/files/306d0081-c07c-456c-b03a-83af5496f789/kofosob.pdf
    • https://uploads.strikinglycdn.com/files/b6b8ce29-5b9b-4ddf-be68-e8204e121aba/dvb-t_usa_frequency.pdf
    • https://1c92f6d8-19eb-429c-9239-1cf6be91372f.filesusr.com/ugd/cc1a03_42e7cb5a05fe478398c74f1f2a6dd719.pdf?index=true
    • 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_off00013ffe.bin
9e2de6ca6a459e6c6ddcb7e16f8b5314cd266354f1b074411562dd1cfeb3cc58		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13FFE 5220 bytes
font_01_sfnt_off000151b4.bin
b369a9478f4ed28a2fc3fd0653befe8371b7e737bc7acf08cf8cdfbbb15b0225		 pdf-font-stream PDF embedded font (sfnt) at offset 0x151B4 10872 bytes

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