Malicious PDF — malware analysis report

Static analysis result for SHA-256 098988e97474a769…

MALICIOUS

PDF

82.8 KB Created: 2021-04-07 15:08:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: f91d2b70cac3863f98ea9ef5016fa6bc SHA-1: 72a1c34923b62efb7f119de545ad2bef529b8128 SHA-256: 098988e97474a76958da754b60709940a73152db7338785e2542422ed4f201b4
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9998

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 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://crophysi.ru/strik?utm_term=brother+toner+tn420%252Ftn450 PDF link annotation
    • http://helplnstagramcontact6088757.com/61491007106cbwml.pdfIn PDF document text
    • http://zigapajuxijado.mywebcommunity.org/physiology_of_kidney.pdfIn PDF document text
    • https://cdn.sqhk.co/kufalavoxig/jjhbLvl/capitalist_definition_in_a_sentence.pdfIn PDF document text
    • http://domsale.xyz/cl_windows_7_professionnel_64_bitsdovf1.pdfIn PDF document text
    • http://fanisore.sportsontheweb.net/frozen_2_script_for_school_play.pdfIn PDF document text
    • http://daating19.site/72338222998rflx9.pdfIn PDF document text
    • https://cdn.sqhk.co/bodorosuzuta/FVAVwia/subway_surfers_java_game_phoneky.pdfIn PDF document text
    • http://bikomowaxibujoj.medianewsonline.com/gym_workout_for_beginners_to_lose_weight.pdfIn PDF document text
    • https://cdn.sqhk.co/jawutuwek/W94GRaY/jejawimaziwaziwir.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/0cdfdb98-856c-4718-b7c5-1422d9dc9132/central_route_dan_peripheral_route_adalah.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/92a023ee-74e3-474f-8abe-156e31eb7dcf/22137549625.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6d2a21d1-6307-420d-9c35-7ad8a6dc3661/67719682591.pdfIn PDF document text
    • http://zejusamipokera.myartsonline.com/functional_textiles.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6f77804a-238b-42f8-b652-aa270dec9042/behringer_xenyx_x2222usb.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c8a8f714-a60b-44aa-9ebd-f11c719da716/goxagozokekebeluga.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/09e9d4db-f28c-4166-9cfd-a5a093fbef46/lebejezuxomub.pdfIn PDF document text
    • http://vafitinupisojud.onlinewebshop.net/90649510774.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e922886b-1e86-4143-8016-2e703ee273be/sat_practice_tests_khan_academy.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_off000105c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105C1 4924 bytes
SHA-256: d0eabe3b75dbb88860426573448aed6daac9a75942007717457865e6d6f87c75
font_01_sfnt_off00011695.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11695 11064 bytes
SHA-256: f66b7ea5588fb0b9c612fcf58c82d923b67f8232a5d3e919bdd8b058a6cb6b52

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