Malicious PDF — malware analysis report

Static analysis result for SHA-256 85f35df864af79ad…

MALICIOUS

PDF

67.6 KB Created: 2021-03-27 23:35:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d68e32efbb4f91d12e4000d92b8c931d SHA-1: b69cabdf92f097b83514da128c3e2b0df32b23fd SHA-256: 85f35df864af79adc3e31df71dbd037da1e1f39000328cd5075b68bd83b0428a
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one heuristic specifically identifying a 'PDF_SEO_LINK_FARM' suggesting a large number of outbound links. The presence of a malicious ML classification and ClamAV detection, along with the embedded URL pointing to 'xezojetit.ru', indicates a phishing or malware distribution attempt. Although no scripts were explicitly extracted, the PDF structure and heuristics suggest it's designed to redirect users to potentially harmful 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://xezojetit.ru/123?utm_term=devanahalli+weather+report
    • http://tuderoba.getenjoyment.net/pusitigo.pdf
    • http://parazepurafeza.medianewsonline.com/noratarapavarejuf.pdf
    • http://farozemirig.scienceontheweb.net/five_minute_activities_for_young_learners.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/9c8df042-52af-4903-858c-05a5e73f949c/gap_factory_baby_boy_shoes.pdf
    • https://s3.amazonaws.com/jemisajoda/arno_pro-_bold_caption_font_free.pdf
    • https://uploads.strikinglycdn.com/files/cac52116-b9db-476c-b7f4-223f4ebbdc63/how_to_throw_out_old_clothes.pdf
    • https://96a9e3af-f0c3-4048-9e6c-0ad8da3c6018.filesusr.com/ugd/15d534_c74b50632a7c41629b77ca9f65a6a278.pdf?index=true
    • https://uploads.strikinglycdn.com/files/edca27cc-0c36-400a-9fe3-f240057dc99b/43666476320.pdf
    • https://uploads.strikinglycdn.com/files/b00be73d-899c-405b-bf4b-53ebeb6003a6/gakinelubawaguvisamapi.pdf
    • https://s3.amazonaws.com/fadadedezeker/razugoj.pdf
    • http://vidoniwofunevan.onlinewebshop.net/biotecnologa_ambiental_francisco_castillo_rodrguez.pdf
    • https://s3.amazonaws.com/tosevud/49804805343.pdf
    • https://s3.amazonaws.com/joterige/how_to_replace_battery_cyberpower_1000avr.pdf
    • https://e5acd528-9925-4355-98ed-6c6122c9c19a.filesusr.com/ugd/49fecd_9b4f894c5dc4462a9ef951c85fe36ce3.pdf?index=true
    • https://s3.amazonaws.com/lofese/cassiopeia_lol_guide.pdf
    • https://s3.amazonaws.com/vizegemawokaxe/bernie_madoff_scandal_summary.pdf
    • https://s3.amazonaws.com/gavapozalilup/beauty_plus_meitu_app.pdf
    • https://s3.amazonaws.com/gajabedafot/what_are_the_for_phases_of_mitosis.pdf
    • https://s3.amazonaws.com/bupesejirijejus/chrome_vinyl_sticker_sheets.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_off0000cdb6.bin
f5a9258ad47eb09c66c2b86e91395386f8beaccbc8967a9265b1470b2921af3f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCDB6 4880 bytes
font_01_sfnt_off0000de63.bin
af85467d6b1319e77a8007e5f375a7bdc7645007ce57651bedd0dca219870f42		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDE63 10236 bytes

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