Malicious PDF — malware analysis report

Static analysis result for SHA-256 26ba459fd5ca34b1…

MALICIOUS

PDF

83.4 KB Created: 2021-03-27 18:40:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 6af4b08a2e409384babf713f2eac2f14 SHA-1: 7f0f6a0d6f0213f09b140c938193a67767f1627c SHA-256: 26ba459fd5ca34b18bb275d2f35beb92beabfc99a9b78c3c16f64a45fb694320
186 Risk Score

Malware Insights

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

This PDF document functions as a link farm, containing numerous external links to other PDF files hosted on disposable domains. The primary lure appears to be content related to 'hottest and coldest places in the world right now', aiming to trick users into clicking through to potentially malicious or spam-related content. The presence of multiple external URIs and the detection by ClamAV as 'Pdf.Phishing.Trojan' strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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
  • 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://seumenha.ru/strik?utm_term=hottest+and+coldest+places+in+the+world+right+now PDF link annotation
    • https://cdn.sqhk.co/mepapogivoma/ctjhhfZ/color_by_number_paint_online_for_adults.pdfIn PDF document text
    • https://cdn.sqhk.co/posaleren/nnuiaZ5/amazon_music_prime_membership.pdfIn PDF document text
    • http://findattime.com/5608629573652b4r.pdfIn PDF document text
    • https://cdn.sqhk.co/sawapevodef/gEaAhdC/viking_cruise_lines_stock_symbol.pdfIn PDF document text
    • https://cdn.sqhk.co/fakosopalo/hhNru99/true_colors_movie_song.pdfIn PDF document text
    • http://form-lnstagramverificationbadge.com/mojejanpbp88.pdfIn PDF document text
    • https://cdn.sqhk.co/guzufaseba/iiigiBe/dragon_quest_7_3ds_hero_vocation.pdfIn PDF document text
    • http://morj.space/how_to_clean_baking_tools_and_equipment8sz1b.pdfIn PDF document text
    • http://pokupka.space/9._snf_fizik_ders_notlar_indircoitv.pdfIn PDF document text
    • http://italonewsero.site/900903766720o403.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/8287c791-462f-427e-b138-b11c2c8c9fc1/61995992458.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/afc541ae-5283-472a-961c-828a633338f2/rajezufozumemelugarur.pdfIn PDF document text
    • https://d8acad56-eb9a-42d1-a06c-a695c5b02328.filesusr.com/ugd/0ad6c7_4cc48b0620be4f2d8c2876a210533b0c.pdf?index=trueIn PDF document text
    • https://3a00e800-a8eb-44ae-aafc-ae9aecab8e06.filesusr.com/ugd/1715bf_21e938351c9d4c66aff328a23fd1b39d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5dea61cb-e84c-4857-b9b3-7425b3e09cbf/how_do_i_fix_a_failed_bios_update.pdfIn PDF document text
    • https://0ac950e2-707a-4e47-8bf4-daface0ea9db.filesusr.com/ugd/356f11_271e0c3e79144b9489df3b2ad6ae077a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc083464-7755-4aaa-bfc3-af231d47f0b0/valewokuzamera.pdfIn PDF document text
    • https://006b50d4-ad2a-4261-8279-34542eb0d7b0.filesusr.com/ugd/a640e9_da43212481934b91ad9bc3895ae5f906.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d67ba520-e547-41c6-86e5-ec4c2a6ddc93/how_to_make_residual_income_uk.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In 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_off0000fa7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA7D 5176 bytes
SHA-256: bd9e93d5fa3a7c108c648a92ad89aea0296bf0ace20f5f76bdbeabd12e2c45a5
font_01_sfnt_off00010c18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C18 11132 bytes
SHA-256: 4af1d396da059e5a03d4deb63ca1943f26d958c653433dc9ae28fc7c4363ad1a
font_02_sfnt_off000131f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131F8 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3