Malicious PDF — malware analysis report

Static analysis result for SHA-256 760bf6a3737ef27b…

MALICIOUS

PDF

77.0 KB Created: 2021-04-04 07:52:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: ed1cc2e5a599b303c09f5981aaac5411 SHA-1: b913d76e2d0925b4ee477eb298a788dce512060f SHA-256: 760bf6a3737ef27bc929076a024ff60611b2bf2b75a7463aa8a560b78d1e47bf
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file exhibits characteristics of a link farm, with numerous external URIs pointing to disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body itself is heavily obfuscated and does not provide clear instructions, but the presence of many SEO-linked PDFs suggests a tactic to evade detection and distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://kuzutuzo.ru/wix?keyword=arc+length+and+sector+area+wells+worksheet PDF link annotation
    • http://mosuxuvemuzuwex.mywebcommunity.org/13330111650.pdfIn PDF document text
    • https://cdn.sqhk.co/kifateten/ZTgcVjg/piano_tap_tiles_melody_magic_mod.pdfIn PDF document text
    • http://xibawolafubiz.getenjoyment.net/arquitectura_neoclasica_en_espaa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446931/normal_60464821ab748.pdfIn PDF document text
    • https://dusimajigedavim.weebly.com/uploads/1/3/1/4/131453199/mexulasemu-vavinub.pdfIn PDF document text
    • http://pobunav.sportsontheweb.net/brecon_beacons_walks.pdfIn PDF document text
    • https://vudujetejagug.weebly.com/uploads/1/3/4/6/134674723/bidedinufone_disurared_xalarepomeliri_wunopo.pdfIn PDF document text
    • http://sotipidikukunow.getenjoyment.net/jnu_ma_sociology_syllabus.pdfIn PDF document text
    • https://ranekiwoj.weebly.com/uploads/1/3/0/8/130814960/787031cb03f8a47.pdfIn PDF document text
    • https://cdn.sqhk.co/votawusebak/QppjfUY/celebrity_slots_sweepstakes_listing_sites.pdfIn PDF document text
    • https://cdn.sqhk.co/xekowodu/eb2eXgh/award_congratulation_letter_template.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408335/normal_5ff9d58890e6c.pdfIn PDF document text
    • https://cdn.sqhk.co/remavaveso/Vij3fha/3d_paper_cut_art.pdfIn PDF document text
    • https://cdn.sqhk.co/kewebogi/j9YfD5l/vosefoxiwubomekukajegapo.pdfIn PDF document text
    • https://wajadotufa.weebly.com/uploads/1/3/1/8/131857144/divigowulux-vevonepemekaser.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379731/normal_5fffeb2c4526f.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/c3d9669a-a137-404e-ba68-006c6b09f933/cuisinart_griddler_deluxe_steak.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/194ebd6b-53c1-47ab-8e16-717d066becf0/microsoft_flight_sim_x_vr.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/186abadc-81c4-43c9-a675-7cd79213f473/midofapawixave.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dc3fa25f-fc82-4a31-a8a4-965cbc45f158/how_to_clean_a_presto_electric_griddle.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/007a31bc-9b45-405f-abca-0c77cdb5f6bc/samsung_fridge_not_making_ice_on_bottom.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7652b6ad-ab67-440b-a9f7-73ad03438fe1/schwinn_202_recumbent_bike_replacement_parts.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d4b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4B5 6440 bytes
SHA-256: 3d4760ca295192c89086870ebbac49c5a5945404ea6ab57fca452cf2db5f569a
font_01_sfnt_off0000e478.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE478 2864 bytes
SHA-256: 1e45634457d00ffd260f50f45b570b897a08ba439f7acab4ec245255aa5f983d
font_02_sfnt_off0000eea9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEA9 5348 bytes
SHA-256: e5744a4c4f0b4c9d79115e5ea8b11a1fd2de388a0c72513f7f12d0ec97023a63
font_03_sfnt_off000100dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100DD 10956 bytes
SHA-256: 272ad5830b2df43949b8a2262a26893b5fff6480320feca13c386123274aa853