Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b26730add56071e…

MALICIOUS

PDF

78.5 KB Created: 2021-03-24 10:40:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 9e19b5a65bf429e1d68bde6b53581ef8 SHA-1: 09c55099f22e1a6b2b6cb4b5a8949a7cd9ed1121 SHA-256: 1b26730add56071ec9a5e8306828568bfe2836cc05de04e832e9c9c2bd01bb3d
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The file functions as a link farm, containing numerous external links to other PDF documents, likely for SEO manipulation or to distribute further malicious content. The presence of multiple external URIs and a link farm heuristic strongly suggests this is part of a larger distribution or SEO poisoning campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://golowaki.ru/award?keyword=materi+akuntansi+keuangan+lanjutan+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4385648/normal_600b40ba71c91.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4499636/normal_5feff671d2692.pdfIn PDF document text
    • https://xujufefar.weebly.com/uploads/1/3/1/4/131483110/9509831.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425921/normal_604dc6c716449.pdfIn PDF document text
    • https://dotanivim.weebly.com/uploads/1/3/4/7/134705276/e2be880d03a73.pdfIn PDF document text
    • https://gabanifuvumot.weebly.com/uploads/1/3/4/5/134588994/peridemose-sujevukaje-rolalafixu-sojugolin.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490516/normal_5fde0d2cacc99.pdfIn PDF document text
    • http://lavka-karamel.ru/the_fall_2013_full_movie_2020ifo54.pdfIn PDF document text
    • http://alkim.xyz/can_you_make_an_ebook_in_canvaolylr.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425005/normal_5ff63507c65c9.pdfIn PDF document text
    • https://tifowufiwadoxi.weebly.com/uploads/1/3/4/0/134098290/pewafir-nakipa-dabupusuvawu.pdfIn PDF document text
    • https://wovigapugup.weebly.com/uploads/1/3/2/7/132710676/batotijazodipakoxati.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/befarekogol/how_to_open_ihome_mouse.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f275a1c5-b78f-4fa4-93df-88101689d0fb/57557166051.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/77803583-c3dc-4c4d-8795-1b3560dc522e/bissell_carpet_cleaner_replacement_parts_near_me.pdfIn PDF document text
    • https://da18e6a8-d720-42de-a88c-3f13daad7efb.filesusr.com/ugd/08fe48_df4fe0fa18304cc1a7b6bbf102767cc6.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xarojapi/sql_server_format_phone_number_function.pdfIn PDF document text
    • https://s3.amazonaws.com/jikopot/toddler_bed_fitted_sheet_argos.pdfIn PDF document text
    • https://4b002d3c-a55f-42ce-816c-238f848e88a9.filesusr.com/ugd/3398cc_b134dd90c1244460a319d6d490c4d3bc.pdf?index=trueIn PDF document text
    • https://9e2901ea-5d25-41a5-867c-54d0774c6e48.filesusr.com/ugd/4d0f37_fd49465eeaf449fd969348407892f617.pdf?index=trueIn 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_off0000f7e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7E6 5356 bytes
SHA-256: cd1b4bc85e746901f31e8da394ea98fd2fb2ad622e2e967c0214caea0dd327aa
font_01_sfnt_off00010a45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A45 10068 bytes
SHA-256: f41690f01c70c04194f128f4da6f3da8037b38d698c31d8eba12ce3636b1280c