Malicious PDF — malware analysis report

Static analysis result for SHA-256 67f8adc19c92290a…

MALICIOUS

PDF

76.3 KB Created: 2021-04-14 10:04:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 21f6b74ddbac785237b968ef6b47fbf3 SHA-1: ddf67bc36c990f02c9e3f82f80f95b54aa43e459 SHA-256: 67f8adc19c92290a3d1a0de3351135b8d4d38e0ce0980012a9a64e0954641bad
186 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm containing numerous external URLs, with one notable URL being https://vilenefex.ru/strik?utm_term=best+putting+drills+to+do+at+home. The document body, though heavily obfuscated, suggests a lure related to 'putting drills'. The presence of embedded URLs and the link farm nature strongly suggest this document is designed to redirect users to potentially harmful sites, possibly for phishing or malware distribution.

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://vilenefex.ru/strik?utm_term=best+putting+drills+to+do+at+home PDF link annotation
    • http://vashe-zdorovie.xyz/32275289604zry9w.pdfIn PDF document text
    • http://femusawar.iblogger.org/acrylonitrile_msds_sheet.pdfIn PDF document text
    • http://5gusevshop.space/american_hustle_life_bts_sub_indo4sw9y.pdfIn PDF document text
    • http://mihetos.xyz/love_ni_bhavai_full_movie_online_plalh46f.pdfIn PDF document text
    • http://7evenrp.ru/astronomy_a_beginners_guide_to_the_universe_8th_editionb0jt0.pdfIn PDF document text
    • http://wanuvutukuv.iblogger.org/42736619691.pdfIn PDF document text
    • http://podarokinsta.site/what_does_it_mean_if_your_smoke_alarm_is_flashing_redxtrnz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://5ec50ee2-6c76-415b-b731-82d7de26534b.filesusr.com/ugd/826e74_a01753839a4f41ffbd35eb46aac4de37.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/108e27dd-24a0-46bd-bc70-e3e7e5057cd8/how_to_describe_a_sunset_metaphors.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/550be080-2025-4d30-842f-79882cf48535/lujixiwujojodawun.pdfIn PDF document text
    • https://32b33340-d9da-4ef7-b3bd-a0ac5134eb71.filesusr.com/ugd/adfa6f_2f5cd443d5424d2ca0e0122521b7c6cd.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nitizobuv/23456827869.pdfIn PDF document text
    • http://riporem.epizy.com/22621046756.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf240af9-ee6a-4cae-8b0e-e11ac27552e7/lost_in_yonkers_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1b3c8d87-b489-44af-b7c1-74d76248c468/how_to_find_angles_of_a_triangle_with_side_lengths.pdfIn PDF document text
    • https://s3.amazonaws.com/buxoparadazegu/buddhism_facts.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fc4f6fbe-feda-4efb-8fad-110b3b4a1fd1/30931932274.pdfIn PDF document text
    • https://s3.amazonaws.com/tobito/guidewire_testing_means.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/46c5d9be-1c29-418a-8443-39669cb81725/drinkwell_platinum_water_not_flowing.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9f91353a-328a-4033-b847-b2bed37863f8/how_to_clean_haier_automatic_washing_machine.pdfIn PDF document text
    • https://s3.amazonaws.com/sulasatevirexo/xubasagimevakiburumosite.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ca1ae164-e8de-49a1-ab0c-3cc975d4124c/tikaxumuloz.pdfIn PDF document text
    • https://e42ce0b3-f376-4cb5-9abe-507fdbb9570c.filesusr.com/ugd/603474_724a979d8ff042d9af3381352431e258.pdf?index=trueIn PDF document text
    • http://konugatevokaxot.epizy.com/business_partnership_contract_template_doc.pdfIn PDF document text
    • https://s3.amazonaws.com/vexosafugunu/29516038475.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_off0000ec38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC38 5420 bytes
SHA-256: a42ca23b100863a1264fbe6297d1a07819e1f28fe297974b74edcb0a5231f8ab
font_01_sfnt_off0000fe80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE80 10732 bytes
SHA-256: f54b8335177f382339cfa53700fb4f16b846d992f29c68fe41935d6202909aed

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