Malicious PDF — malware analysis report

Static analysis result for SHA-256 773aa2425bf23e04…

MALICIOUS

PDF

69.6 KB Created: 2021-04-02 03:44:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 694615c8ac3bfd4ef0e3464db2a55043 SHA-1: b7e9146fafae80203d05ce55d41c2e95e32d1f27 SHA-256: 773aa2425bf23e0419554fa2bae3e1e113a4c990b4b8601e39dadd34629a76bc
244 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded URLs, many of which point to redirectors or disposable hosting, indicating a link farm. One critical heuristic identified a link to known malicious redirector infrastructure. While no scripts were extracted, the overall structure and URL distribution suggest a phishing or SEO manipulation scheme, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/wix?keyword=more+than+anything+lyrics+lamar+campbell+chords In PDF document text
    • http://dabipijejunale.22web.org/define_marketing_plan_in_advertising.pdfIn PDF document text
    • http://bakevez.22web.org/wings_of_fire_graphic_novel.pdfIn PDF document text
    • http://mubojumef.iblogger.org/nawatuwudin.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/fajetufekejo/al_ittihad_jeddah_fc_form.pdfIn PDF document text
    • https://s3.amazonaws.com/wujanozo/14828149003.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba3d20cf-ab77-471f-aa12-d47b50707e16/61380211419.pdfIn PDF document text
    • http://talakukatutevib.epizy.com/osho_courage_the_joy_of_living_dangerously.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2319f2af-1630-4870-8533-7e782c043dea/39171241100.pdfIn PDF document text
    • https://s3.amazonaws.com/bopuxosavubare/agenda_docente_2018_para_imprimir_gratis.pdfIn PDF document text
    • https://1ffb5d6c-d890-49e0-9b87-dc10fbfa49e2.filesusr.com/ugd/8bc2a6_2788e2c14d104ba59b5ef23767c51915.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/082b2ea0-39a2-4688-8076-97c225ab2c75/time_management_tips_for_high_school_students.pdfIn PDF document text
    • http://kobukapun.epizy.com/wow_dire_maul_west_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/42a99c30-c9f6-4b20-815f-2b291ed541ab/arbys_menu_nutrition_mozzarella_sticks.pdfIn PDF document text
    • https://s3.amazonaws.com/sisaxu/toyota_rav4_fuel_economy_l_100km.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2fce481b-6c49-4ed2-9240-d4000958e4cb/what_does_the_dmv_eye_test_look_like.pdfIn PDF document text
    • https://b0c090b1-cb02-46d8-8a69-3fb9d82636b6.filesusr.com/ugd/4dbf3f_1b30235dae6d49bc8b556877ceca63b2.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/08d5b2b5-12ae-4aed-a278-8a467208d959/84569749632.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/75cb035b-4258-4f69-94fc-771efb393b67/razologafege.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c665ae95-f122-4809-b13e-c5ce521cb965/vonedarabojinik.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dfa3717d-ffe9-4f61-9433-ce3a7a5d33fa/maytag_bravos_mct_dryer_blower_belt_replacement.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5fd0d771-883d-4968-a6bd-2803f93e2fed/45703621800.pdfIn PDF document text
    • https://e18e6c05-101e-4f41-9c4d-f518aea09dbb.filesusr.com/ugd/7972b3_3fb8b2daefd649c7a69a96c5ecd86896.pdf?index=trueIn 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_off0000d3e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3E2 5736 bytes
SHA-256: b234bc809019c46ab474dc3a3e7a97bb562b9833b1464a8370bb49dcd88658df
font_01_sfnt_off0000e749.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE749 9856 bytes
SHA-256: f1c746f5ee279cb9f7378b2b1a2b32b149688dbbdf838f33ce4044d8d8f75f66