Malicious PDF — malware analysis report

Static analysis result for SHA-256 4dbf7c3e68c3b785…

MALICIOUS

PDF

75.2 KB Created: 2021-03-24 11:19:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c06e80a55fb6268e4f907bf66b7a0ac3 SHA-1: df10d6c628c6cb1ba90250bebc3bf5c5e8badf1e SHA-256: 4dbf7c3e68c3b7859f8036b0de493ba8984a51697782b64cc2b8ac74c28c91e6
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 likely part of a link farm designed to manipulate search engine results. The primary URL, 'https://golowaki.ru/wix?keyword=fire+and+fury+scenarios+pdf', suggests a lure to a page that may host malicious content or phishing attempts. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://golowaki.ru/wix?keyword=fire+and+fury+scenarios+pdf
    • https://cdn-cms.f-static.net/uploads/4450353/normal_5fd28d0ec2d71.pdf
    • https://cdn.sqhk.co/vegedusovo/ghjhfhg/jump_jump_a_dungeon_adventure_time.pdf
    • https://cdn.sqhk.co/rufebumu/hemY7Hb/photo_editing_software_effects_filters.pdf
    • http://mpvideo.org/mubareligovejubodjkw3e.pdf
    • https://cdn-cms.f-static.net/uploads/4495531/normal_605aa98eb27b4.pdf
    • http://livecopyrightverification.com/764402277326wym.pdf
    • https://vemakovuzabomon.weebly.com/uploads/1/3/4/8/134881214/vuwajasarixol-danisuxazulo-pojidele-bizibif.pdf
    • https://jobuvurivoko.weebly.com/uploads/1/3/2/6/132681743/fimepepapul.pdf
    • http://trynon.xyz/superfight_card_game_near_me8exgk.pdf
    • http://lamovingcompany.com/scene_definition_literatureyrot1.pdf
    • https://bipuwuvi.weebly.com/uploads/1/3/0/7/130776795/9524635.pdf
    • https://cdn.sqhk.co/manuguwe/Lsjjbgh/alone_marshmello_fortnite_event.pdf
    • https://cdn.sqhk.co/napumefu/hfZYvjj/enerpac_air_over_oil_pump.pdf
    • https://cdn.sqhk.co/tijanukubo/jbhizji/29695627239.pdf
    • https://cdn-cms.f-static.net/uploads/4452374/normal_6054433116b7b.pdf
    • https://cdn.sqhk.co/vakolitakap/mjajdjj/45789896771.pdf
    • https://cdn.sqhk.co/zalenelavup/gQ3sgGv/acceder_a_mon_compte_icloud_sur_android.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/2ec76040-e745-4e78-8dfc-d135b42e34c0/what_are_the_5_levels_of_the_caste_system.pdf
    • https://uploads.strikinglycdn.com/files/bf768fc2-51d2-4277-9396-80149d5b85d1/nikogebikunuvo.pdf
    • https://uploads.strikinglycdn.com/files/202786c6-adff-4038-b180-eff3aabd9b05/kologabu.pdf
    • https://uploads.strikinglycdn.com/files/d477e3e2-e7cc-4c93-bc70-9f21df9d1319/which_post_comes_under_bpsc.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_off0000e6a7.bin
5ff2c2930a43a9ab5fc9621f6975e1460c3af53d33dc8c0532b35c38b13a401b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE6A7 5176 bytes
font_01_sfnt_off0000f863.bin
cca3a3d590a649ff4aa963e7bd5e592e26998695a6b9e8cc0a2ab7ab49395873		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF863 10836 bytes

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