Malicious PDF — malware analysis report

Static analysis result for SHA-256 4007054b519053aa…

MALICIOUS

PDF

75.0 KB Created: 2021-06-08 20:00:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 8f5b22e40485d07ff95b6f93d7dd5a91 SHA-1: 67acceea3f77834d96bb96dd0ab6e05788e7b831 SHA-256: 4007054b519053aad3128fb136662aacd4dabdac5b4d97e9b99aac96155e3b44
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous external URIs, with a primary suspicious URL pointing to a site that appears to be involved in distributing potentially unwanted or malicious content. The PDF's structure and the presence of many external links suggest it is designed to redirect users to other sites, potentially for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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://wastran.ru/pbw?utm_term=picsart+gold+version+apk+latest+update PDF link annotation
    • https://pajulabilo.weebly.com/uploads/1/3/4/6/134620642/d4f28a0.pdfIn PDF document text
    • https://vokewubepil.weebly.com/uploads/1/3/4/4/134443825/vuzetadawovix-vivutogitix-siluzajaregiv-fimexowa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470985/normal_603793f71049b.pdfIn PDF document text
    • https://ponamuti.weebly.com/uploads/1/3/4/5/134513888/3335055.pdfIn PDF document text
    • https://suxapenogabako.weebly.com/uploads/1/3/4/6/134602080/fd5a7e7ce06.pdfIn PDF document text
    • https://pirovosarelivo.weebly.com/uploads/1/3/1/4/131406751/f47e8299.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383912/normal_60b9f34894744.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/8825856a-1c3f-4ef8-930c-ea8952adfdda/jonilurupe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a8dce2cb-7635-41da-8e42-33815f428be9/duravuku.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d44d2c01-3be5-4b69-bf69-aeac0f12d839/gedukodubajulubaxe.pdfIn PDF document text
    • http://sawanixum.pbworks.com/w/file/fetch/144521466/job_offer_letter_from_employer_to_employee_australia.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/20c2d468-859c-4d9b-ae34-c0c253bcd934/navy_diversity_months_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bdbbf21f-dd7b-4785-b21d-dd24cfe8fb81/mr_coffee_12_cup_coffee_maker_water_filter.pdfIn PDF document text
    • http://zufiwuz.pbworks.com/f/call_of_duty_garena_mod_apk_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2cfcba89-dcaa-4d5e-b20d-1051f300cc36/67667527806.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2c80b54c-9a16-470a-92dc-6ba596154975/how_do_i_update_android_auto_in_my_car.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4fb7566d-96a7-4bf2-bd32-6f60a25bc7e1/what_is_the_standard_medical_deduction_for_2020.pdfIn PDF document text
    • http://gipovowi.pbworks.com/w/file/fetch/144838905/73928307500.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f28a4971-48bc-4b13-ab36-1b69119df004/kimuxelovit.pdfIn PDF document text
    • http://dupalalo.pbworks.com/f/pabirenegaxejogu.pdfIn PDF document text
    • http://waxijoruv.pbworks.com/w/file/fetch/144811917/mivujidudibegikisizopev.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_off0000e726.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE726 5368 bytes
SHA-256: e9ac4156759edc40d647a5ffcb797d5704eadb0d6d63a88e38322802355b5439
font_01_sfnt_off0000f983.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF983 10868 bytes
SHA-256: 093db6fe58342c0b5d9adc9d6d45373af859d09404d93788571de84da2c160bc