Malicious PDF — malware analysis report

Static analysis result for SHA-256 3efa919e1fab6d7e…

MALICIOUS

PDF

97.1 KB Created: 2021-03-14 00:55:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 6916c7742dd956dfb0e4685d9483d912 SHA-1: 4c78440c3c10b04ac4bcf87cdd2f65bac85c9228 SHA-256: 3efa919e1fab6d7ed2b267944814c93d672309e14978cbc31737927e4d441e9a
184 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to disposable hosting or redirectors, indicating a link farm designed for SEO manipulation or phishing. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to redirect users to malicious sites for credential harvesting or malware download. No scripts were extracted, but the PDF structure itself is indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5532

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://xezojetit.ru/strik?utm_term=on+course+skip+downing+free+download PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4408704/normal_5fd1cc8752d9c.pdfIn PDF document text
    • http://shopmzm.site/kenmore_elite_top_load_washer_parts_diagramath8n.pdfIn PDF document text
    • http://thehensleys.org/how_to_program_comcast_remote_to_bose_surround_sound9b1gi.pdfIn PDF document text
    • http://wekeb.space/inspire_homeschool_high_schooloe62r.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4477387/normal_5fdde065f388c.pdfIn PDF document text
    • https://senovaxevuka.weebly.com/uploads/1/3/5/3/135304629/3e79fe2a1.pdfIn PDF document text
    • https://xinogibujijinak.weebly.com/uploads/1/3/4/2/134235465/489ad18f06c470.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nolusiwafaki.epizy.com/shinchan_car_cartoon_video.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/509fd26b-f5d5-4db7-a373-27d0874ae00d/14487744862.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e6310229-0d2d-45eb-9fc1-1c8f18b39f07/nomorek.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/caab6a5e-f2ed-415b-a0b8-f86aae9244f1/n600_netgear_review.pdfIn PDF document text
    • http://refunifowaruge.epizy.com/lagu_ost_cheese_in_the_trap.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ccdd320f-d1b9-43f3-a296-2eb175bfd0c6/what_foods_have_lots_of_calories.pdfIn PDF document text
    • http://denaruzunus.epizy.com/pemolibesexobatul.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e05602fb-69a7-441b-a3ad-0cdbab9d7fdd/shark_navigator_lift_away_deluxe_brush_not_working.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/197223aa-265e-4bb0-8118-4ae785594977/jogotewusosunazuzujorok.pdfIn PDF document text
    • http://belukamafanes.rf.gd/battlefield_1_android_apk_data.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9149a4e2-fc49-4032-8ce8-bfb007878760/elkay_water_fountain_ezs8l_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3ac321cc-be64-4141-b0bb-41d07f89862e/gen_math_book_grade_11.pdfIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ecae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECAE 32092 bytes
SHA-256: 556cc5f8f04b7a40265a447777a38b925e66e3ea34de7a21251af4dcc6fe497f
font_01_sfnt_off00014f86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F86 5504 bytes
SHA-256: 247a8dfc7b48279c7c7a14f581545b696ef25d272750018ef6b8c541c3411d5b
font_02_sfnt_off00016269.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16269 10972 bytes
SHA-256: ba0314e778d8cd173765bc01ada2b6254b7631a4623e29da65b4fa6b695f407a