Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf9528c8cd9ce17d…

MALICIOUS

PDF

69.1 KB Created: 2021-04-04 17:20:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cad721e898141f81fd6bdc6fe20db012 SHA-1: d0af5bd31fe4e8b6ebc6b4e0ac1299801f2db13d SHA-256: cf9528c8cd9ce17df64b85676d405893bd18bb813d6d251c641ac53c5940c8a5
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, specifically as a phishing or trojan delivery mechanism. It contains a mass of external links, with one prominent link pointing to 'https://dafemum.ru/123?utm_term=captain+fantastic+soundtrack', suggesting a lure to a potentially malicious site. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic indicate an attempt to redirect users to external resources, likely for phishing or malware distribution.

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://dafemum.ru/123?utm_term=captain+fantastic+soundtrack
    • http://rexapeduke.66ghz.com/check_your_english_vocabulary_for_ielts.pdf
    • https://cdn-cms.f-static.net/uploads/4470526/normal_602df2dea1e77.pdf
    • https://mivagadak.weebly.com/uploads/1/3/4/5/134599435/4c1f892684272.pdf
    • https://cdn-cms.f-static.net/uploads/4475987/normal_600c19f8ab0e9.pdf
    • https://baxukeze.weebly.com/uploads/1/3/0/8/130874478/801d8cc.pdf
    • http://kinatoguvekajux.22web.org/mukodiwilibifedu.pdf
    • https://cdn-cms.f-static.net/uploads/4372723/normal_60114838d9a08.pdf
    • https://cdn.sqhk.co/tesadubozino/jAiqggQ/969286945.pdf
    • https://cdn.sqhk.co/xavexapoxiv/cRgdLuq/lep_s_world_2_hack_mod_apk.pdf
    • https://cdn.sqhk.co/puxolika/jdhjhgM/pearson_physics_class_9_download.pdf
    • https://cdn.sqhk.co/gubujurit/sTtgfhe/extreme_car_driving_simulator_online_download_softonic.pdf
    • https://cdn-cms.f-static.net/uploads/4375698/normal_605d7e7526128.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/dc782d39-56a3-4312-9f52-cafa3cbc1f57/how_to_use_kidde_carbon_monoxide_alarm.pdf
    • http://nolumuj.epizy.com/reviews_on_maytag_5.2_washer.pdf
    • https://uploads.strikinglycdn.com/files/9b5973c8-289f-49e3-ae6b-9635b8b1d4a3/kofuxas.pdf
    • https://uploads.strikinglycdn.com/files/fc198432-6adc-4735-8b4e-bedf39bea5a3/dd_warlock_spells_list.pdf
    • https://uploads.strikinglycdn.com/files/96abd772-c8fe-4742-ba55-9ca7853ec170/what_belt_does_a_bissell_powerforce_helix_turbo_take.pdf
    • https://uploads.strikinglycdn.com/files/20d202e2-3a5b-4f76-b54f-90a068e3e35c/30258718512.pdf
    • https://uploads.strikinglycdn.com/files/68f5d179-79b3-4a63-9c33-f3ea42e948db/jujegujuxojosika.pdf
    • https://uploads.strikinglycdn.com/files/e88e0177-1da4-4f2e-8276-a43293fec2dc/computer_hardware_stores_near_me.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_off0000ce54.bin
3b5eb50c59cf0e2d93fabd182f47ecb7b490ba38c1f5a2b69f2175b2135c150f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCE54 5084 bytes
font_01_sfnt_off0000dfb7.bin
e8a966994b637cc44137a3725253916ccc5e6ccfe6f08c952e9676ac30b0233a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDFB7 11592 bytes

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