Malicious PDF — malware analysis report

Static analysis result for SHA-256 1894453e06bc305a…

MALICIOUS

PDF

82.4 KB Created: 2021-03-07 01:07:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 068b48771ab8a0252e72475b95c9f1c0 SHA-1: 7c11b0cefb4107d6854a7077ffe08381db7dff7c SHA-256: 1894453e06bc305a3e74b70d58173101c105c621520b6260392e71790d517451
244 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to disposable domains and redirectors, indicating a link farm designed to lead users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. The document body's garbled nature and the presence of wkhtmltopdf metadata suggest it was programmatically generated to host these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://dafemum.ru/wb?keyword=theory%20of%20relativity%20simplified%20youtube In PDF document text
    • http://megahit.space/8114859664160l79.pdfIn PDF document text
    • https://nagiwudulowep.weebly.com/uploads/1/3/0/7/130775657/1469995.pdfIn PDF document text
    • http://silkhfig.bid/rexomawugaxadonevakeligoxa3ne.pdfIn PDF document text
    • http://monongzhlh.space/sajinoxuletefenufudu9yrgs.pdfIn PDF document text
    • http://abwaab.su/space_shuttle_orbiter_flight_deck4x5js.pdfIn PDF document text
    • https://cdn.sqhk.co/todiwapubu/ghiiRbz/this_means_war_full_movie_online_free.pdfIn PDF document text
    • https://lopuxewununoj.weebly.com/uploads/1/3/4/7/134748711/zivuronituloloja.pdfIn PDF document text
    • https://duvutotan.weebly.com/uploads/1/3/0/7/130775700/juneloritizop_belimeguxa_zezifin_xuwijibaxawaz.pdfIn PDF document text
    • https://cdn.sqhk.co/vasegodesazu/CBhdhbp/rapewuvezolajodimemef.pdfIn PDF document text
    • http://titoto.xyz/sportline_stopwatch_model_228uu60j.pdfIn PDF document text
    • https://cdn.sqhk.co/wukufazujuv/chi35jb/impossible_road_game_download_free.pdfIn PDF document text
    • http://duperalenow.22web.org/christmas_card_writing_template_ks1.pdfIn PDF document text
    • https://gituruledutaza.weebly.com/uploads/1/3/4/4/134401886/situbufadelevatov.pdfIn PDF document text
    • https://cdn.sqhk.co/linidivez/alTDykY/map_my_walk_sync_with_apple_watch.pdfIn PDF document text
    • https://nerapusu.weebly.com/uploads/1/3/1/4/131438180/tevumofi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://1a6defe7-92a0-4357-8a70-d3bce85d30c9.filesusr.com/ugd/385065_80138397eea84f23a3fd29d95e6d5d1b.pdf?index=trueIn PDF document text
    • http://bopuxenuxesozu.rf.gd/frog_circulatory_system.pdfIn PDF document text
    • https://5e20aa6b-77ef-4f11-9344-5454fb7c649c.filesusr.com/ugd/fb3aa9_adb529d00bde414e856685d6869689ac.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6332c8a3-a152-42bb-aca8-45040081735c/how_often_should_you_do_ddp_yoga.pdfIn PDF document text
    • http://vuzosaxa.epizy.com/wikadanikubabilili.pdfIn PDF document text
    • https://1bf92926-22d0-44a1-94fb-b51843c41cd5.filesusr.com/ugd/762c1a_9667f8232b314372a365f8959deac658.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0d5fa325-63ae-4a9c-9239-4faad0af72d2/what_is_an_example_of_a_quantitative_question.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8cacf38f-d45e-43db-a15d-1da9fa1bd788/zitemitutelulogetafo.pdfIn PDF document text
    • http://roxonolabixatox.epizy.com/piano_sheet_music_creator_online.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_off000105b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105B8 5532 bytes
SHA-256: e8cd28fa04832cb1d952513429819dbd7e3bf68138bdb94512ac28299522303f
font_01_sfnt_off00011867.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11867 10276 bytes
SHA-256: fac56623ec0fb69e68b78ec0b0b7bb7a11b84205a9a478eb8f0a23b47dc802ec

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