Malicious PDF — malware analysis report

Static analysis result for SHA-256 7642efe4091e18ff…

MALICIOUS

PDF

98.2 KB Created: 2021-03-15 14:47:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 661adc60dd49bbcccf5653d41bb715f6 SHA-1: 6bd5a1e1a3dda4093f96e6c14dab3a60b38ddcaf SHA-256: 7642efe4091e18ff4425fc6d4a04b8f2d114b85789759a424cea8ff171c4c3e8
154 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 SEO-optimized and point to other PDF documents, indicating a link farm or SEO spam campaign. The ClamAV detection and ML classifier also flag this as malicious. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest an attempt to redirect users to potentially malicious or spam content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7633

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://botokaw.ru/award?keyword=hyundai+avante+xd+2020+manual+pdf
    • https://cdn.sqhk.co/tixukiko/ghjfVgh/rapoladawobopugexupus.pdf
    • https://cdn.sqhk.co/ketofebem/OGgahhg/lozopirutasuw.pdf
    • https://cdn.sqhk.co/mimonenod/jVnMeHk/vevajofodigabowunegilow.pdf
    • https://cdn.sqhk.co/guzunilepin/lnhejc3/jetpack_joyride_2_player.pdf
    • http://meweremidef.iblogger.org/music_mixer_and_beat_maker_free.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/nuruvapozixix/how_do_i_program_my_directv_remote_to_my_stereo_receiver.pdf
    • https://uploads.strikinglycdn.com/files/86bca481-d3ab-4ba5-b2f9-cf8ea3c17cd6/tiwagixufusanobuxafe.pdf
    • https://d8acad56-eb9a-42d1-a06c-a695c5b02328.filesusr.com/ugd/0ad6c7_dadfd3e584684493bccf34d34e1b9199.pdf?index=true
    • https://uploads.strikinglycdn.com/files/7af7ad72-707e-4817-a143-eae4fc850147/19912990528.pdf
    • https://s3.amazonaws.com/mojivikapeti/credit_information_report_kuwait.pdf
    • https://uploads.strikinglycdn.com/files/a0a6c30c-a9c9-4988-bd26-2618e9fc7836/85680600053.pdf
    • https://s3.amazonaws.com/wotodedaruzuk/74214909474.pdf
    • https://uploads.strikinglycdn.com/files/ba278d8d-39d1-4058-9dc9-2e615faa7990/junior_guide_sabbath_school_lesson.pdf
    • https://uploads.strikinglycdn.com/files/c4daa9bb-660a-4b1a-bbab-aadbd9587828/rakexevusadijadizu.pdf
    • https://uploads.strikinglycdn.com/files/81125da4-cde3-48c9-9bcf-af50cc3e7c0d/tom_clancy_jack_ryan_books_chronology.pdf
    • https://1e16f6d7-285b-4488-bf07-d3e24ac90e20.filesusr.com/ugd/417718_5e84c10eb01646cb80f79111bfb4edd9.pdf?index=true
    • https://edcb5511-827b-40b0-97c1-3499c313f96b.filesusr.com/ugd/0779a3_a6d2f58e75eb44dbbdff35440c3511aa.pdf?index=true
    • http://pavemadimakok.epizy.com/89934851029.pdf
    • https://uploads.strikinglycdn.com/files/bf771283-0284-4e59-a5f4-9d133517bc61/baca_light_novel_tales_of_demons_and_gods_bahasa_indonesia_chapter_486.pdf
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013e49.bin
601cf54c7cba65892addc705f4574442976f639523678988818343c6e781fc52
pdf-font-stream PDF embedded font (sfnt) at offset 0x13E49 3520 bytes
font_01_sfnt_off00014ad5.bin
64d381d13a0ff5571ed01ea3bbeeccd0d91a6c4eb4717cedbec4b30dd6d37da1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14AD5 5376 bytes
font_02_sfnt_off00015d22.bin
5f8b465b7c6a8ab65ef5242ac58cdce454a66e1c02922536adf0640349c82b4e
pdf-font-stream PDF embedded font (sfnt) at offset 0x15D22 11364 bytes