Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb0daf1ba0dc1c7b…

MALICIOUS

PDF

84.8 KB Created: 2021-03-14 22:21:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: e811abf6e4de3d5fc5b641fc9af699d2 SHA-1: 57e210cda55fed7213aae587c2411d4cbfa3e67b SHA-256: cb0daf1ba0dc1c7b25724b4fe6bbbeb24f96efe53da4f6196431adb2d44921cf
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://soxebez.ru/award?keyword=ielts+general+writing+task+2+samples+band+8+pdf PDF link annotation
    • https://cdn.sqhk.co/rivogigaweb/ThcnDQ4/jijas.pdfIn PDF document text
    • http://monofijejawajo.iblogger.org/across_the_bridge_novel_download.pdfIn PDF document text
    • https://cdn.sqhk.co/pijavagoke/gaFjfgi/javiruxemuxu.pdfIn PDF document text
    • https://cdn.sqhk.co/guwaloxipete/ddXjaij/nanuzife.pdfIn PDF document text
    • https://cdn.sqhk.co/bunewonu/SQ0difT/90349956420.pdfIn PDF document text
    • https://cdn.sqhk.co/rujamuzizogo/hgljdgi/wurujikojenediduvimitam.pdfIn PDF document text
    • https://sukizasatesez.weebly.com/uploads/1/3/4/6/134686833/goniwemirud.pdfIn PDF document text
    • https://cdn.sqhk.co/jepipovi/ggUY5hh/street_of_rage_4_full_game_download.pdfIn PDF document text
    • https://cdn.sqhk.co/wunokebewoz/hgK5Nic/83352388196.pdfIn PDF document text
    • https://cdn.sqhk.co/fuwinoxaxava/9jfjcLu/zixasirukotewanazas.pdfIn PDF document text
    • https://cdn.sqhk.co/tuwetebep/6hiJjh2/how_to_get_energy_blast_ffx.pdfIn PDF document text
    • http://fatokopos.22web.org/comptine_d_un_autre_t_sheet_music.pdfIn PDF document text
    • https://wuxorazaw.weebly.com/uploads/1/3/2/7/132712222/1e6cdf9df2423ea.pdfIn PDF document text
    • https://cdn.sqhk.co/nizekidido/VhiYUih/cats_and_dogs_jigsaw_puzzles.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/61af3e57-ba36-46c7-ada5-122287cbc705/can_you_make_iced_coffee_with_nespresso_vertuo.pdfIn PDF document text
    • http://jijuxomofa.epizy.com/30160170534.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c02fbef3-f3bb-45d5-9ab9-e9e0fd5ea412/33985216826.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fd148bb3-7cf5-4e22-ba46-b6ced55ee3ed/gesiv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/324d14b5-1b89-44bf-9c3c-dd2f5b1b3793/jabra_gn9350e_battery.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eea710dc-409c-4df8-b6a3-8b006ed8e736/basic_english_grammar_book_2_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2021bfc7-77a2-47cb-92e7-5a445bdd0d68/how_to_decorate_a_beautiful_christmas_tree.pdfIn PDF document text
    • http://foxorefo.epizy.com/inscription_formation_agregation_interne_eps_creteil.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ac3f59aa-d563-4734-a5d9-30575baf83ec/attack_on_titan_character_season_4.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0bc96923-21d4-4fc1-ab84-52e63568eee7/foxconn_n15235_mainboard_specs.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010a46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A46 5920 bytes
SHA-256: 018a3017ee3cbaf3acec717785e22551883ed8119b119d144de999382aa7ddde
font_01_sfnt_off00011e64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E64 11032 bytes
SHA-256: df489bc51fedd1b7e6c0d26b429fd7947be7aa2f999a10ca9d1a3c80bc8fcdd4