Malicious PDF — malware analysis report

Static analysis result for SHA-256 0cbe1fecb58221d9…

MALICIOUS

PDF

88.0 KB Created: 2021-06-07 08:13:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 2c2546e9a85fba1c1b3c3563be043595 SHA-1: 6cf062643f1ac4218ee19f13de8db96e1ab2eb73 SHA-256: 0cbe1fecb58221d96888d9d9d05d1cd7a843ebcd46f056d8bffd851577f753ed
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm or phishing operation. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or scamming by directing users to potentially harmful external sites. Although no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of malicious activity.

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
  • 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://laborke.ru/pbw?utm_term=connection+game+in+tamil+with+answer PDF link annotation
    • https://josuzowonuni.weebly.com/uploads/1/3/4/6/134685096/tefoxofaxegol.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4528959/normal_5fef0df20a89e.pdfIn PDF document text
    • https://tipepopodotojo.weebly.com/uploads/1/3/4/6/134636352/kinijasekodemuno.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481409/normal_600af3ad4f95e.pdfIn PDF document text
    • https://wojopegoguw.weebly.com/uploads/1/3/4/6/134690206/c4d3e44643c1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455660/normal_604685a0e76c3.pdfIn PDF document text
    • https://vizegibog.weebly.com/uploads/1/3/4/4/134458583/5b02d07e656.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401546/normal_6017689d388ec.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385412/normal_6047bd7956162.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383930/normal_603b6769b5ac4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373281/normal_60044d65be198.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393631/normal_601a7280def11.pdfIn PDF document text
    • https://zudejuzire.weebly.com/uploads/1/3/2/6/132681250/xodagew.pdfIn PDF document text
    • https://rivixemip.weebly.com/uploads/1/3/4/6/134609840/5d02e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366407/normal_5ffbd20301a0b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406482/normal_5fdbbe6c3ae75.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/3640cf05-f0db-45e9-9758-698b0855d5bb/car_emergency_kit_list_reddit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/beb0f37e-cef2-4fd7-9fcc-23b561a1fb02/a_link_to_the_past_gba_rom_hack.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d3e31edc-0cb5-49e9-b525-fbc47fccd47f/la_crosse_technology_radio_controlled_wall_clock_instructions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/89546c0f-b3fa-4103-b7f6-94fb377155cb/how_many_btu_do_i_need_for_a_mobile_home.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6bc293c6-4e86-409f-83b7-ed848ef6ceeb/76644413949.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/132fec00-8249-4fb2-af80-67b76b8ab686/gidenidemedid.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_off00011917.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11917 5212 bytes
SHA-256: a5c004af2318415442b5988d8a881534d3aad79bb6fa9050dc5945d1af76c16c
font_01_sfnt_off00012ab4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AB4 11736 bytes
SHA-256: 60b38d7067f48ceb7a667fa5d16420699ea83e588251be3e1e32053011dc2f53