Malicious PDF — malware analysis report

Static analysis result for SHA-256 91a44359b60325a7…

MALICIOUS

PDF

73.6 KB Created: 2021-04-06 23:29:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 20e88b111834c8c551c354161dbf5b89 SHA-1: 7aef909ff11f8e8cb84db7110da5acd9099b6dd3 SHA-256: 91a44359b60325a7b637fef54c65d220cc9a5332912a494cbcd077fc84bf83f7
154 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, many pointing to potentially malicious domains, indicating a link farm or phishing lure. The heuristic PDF_SEO_LINK_FARM and PDF_URI firings strongly suggest this intent. While no scripts were directly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9739

Heuristics 4

  • 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
  • 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://jumiwimov.ru/award?keyword=bohat%25C3%25BD+t%25C3%25A1ta+chud%25C3%25BD+t%25C3%25A1ta+pdf+ulozto
    • http://mx50off.pro/771513361854ft9c.pdf
    • http://rodsfish.club/luxamapelada7v22w.pdf
    • http://nitapida.mywebcommunity.org/mbr_membrane_bioreactor.pdf
    • http://youtube-subscribes.com/vidudewo5c7d.pdf
    • http://agent-ritual495.online/frozen_cartoon_songs_download_mp3s8c2c.pdf
    • http://all-casino.xyz/67058357878dybyy.pdf
    • http://kerosijuvibeg.scienceontheweb.net/introduction_to_geographic_information_systems_8th_edition_free_download.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/kosipefojaw/fifa_world_cup_song.pdf
    • https://s3.amazonaws.com/nosepevozux/georgia_guidestones_address_for_gps.pdf
    • https://uploads.strikinglycdn.com/files/108a9967-ff74-42e9-8bef-206fcd73ae39/90016375336.pdf
    • https://s3.amazonaws.com/tubukeganuji/82945696761.pdf
    • https://dfa52777-3edb-460f-9b14-ca5101cd4ecc.filesusr.com/ugd/5360f8_a8c040f967c64e2fb0b9230d3b181dee.pdf?index=true
    • https://1f2f8e77-98df-4c5e-b88a-83bc2b612b58.filesusr.com/ugd/5c7528_cf057849925b4c1bb6cd0a758126131a.pdf?index=true
    • https://uploads.strikinglycdn.com/files/ebdc8dba-aeb7-456e-a839-f3a44b004918/89697830229.pdf
    • https://uploads.strikinglycdn.com/files/74ffd0d7-97f3-4701-aa86-db2b18b36be8/mukugakufinuvedowo.pdf
    • https://s3.amazonaws.com/rebesudanolo/latest_news_about_lockdown_in_india_extension.pdf
    • https://s3.amazonaws.com/rikolesafuwofar/zorapemizeni.pdf
    • https://75cc4b12-69da-4024-8422-75f9303faa99.filesusr.com/ugd/d6c222_fed637d4570d465cbb014484d7562ecf.pdf?index=true
    • https://s3.amazonaws.com/nowokil/fisomipanabofama.pdf
    • http://kepawomokatuke.myartsonline.com/how_to_prepare_for_physics_exam_class_11.pdf
    • https://6e37e838-c278-4d46-baa9-25b8497af200.filesusr.com/ugd/fbcb80_0865b8f136684a00800a8bdfae764bba.pdf?index=true
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f941.bin
c2aa3f2fd44860be504c361331f5a89b1b5a2c47de7a1966b7dbbe28f2b3248a
pdf-font-stream PDF embedded font (sfnt) at offset 0xF941 5428 bytes