Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f8c603d9ca69eab…

MALICIOUS

PDF

77.2 KB Created: 2021-06-10 20:00:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: ebd749ba2ed5bed8999d17287bc1c303 SHA-1: 2a50bb40cfac152a87193d42cf179006f254f2ae SHA-256: 1f8c603d9ca69eab19071d3d9f700465b474036d32635c33320ec8ba893bcd91
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://smidgel.ru/pbw?utm_term=filmorago+premium+free+download PDF link annotation
    • https://wovanawobudiw.weebly.com/uploads/1/3/5/3/135332940/6834203.pdfIn PDF document text
    • https://jikodidujur.weebly.com/uploads/1/3/5/3/135319234/d6cc5a373254.pdfIn PDF document text
    • https://bovefunovowuto.weebly.com/uploads/1/3/0/8/130873908/xeper.pdfIn PDF document text
    • https://golefovaxogig.weebly.com/uploads/1/3/4/8/134889684/pinozimabodebik.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365646/normal_6038694551987.pdfIn PDF document text
    • https://pefasuvut.weebly.com/uploads/1/3/4/7/134716349/tiweforadupusovow.pdfIn PDF document text
    • https://javumegibevi.weebly.com/uploads/1/3/4/6/134634398/nodarodunudotigux.pdfIn PDF document text
    • https://xawewidijaxiju.weebly.com/uploads/1/3/4/2/134266046/viparalis.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386618/normal_600ca102e7a85.pdfIn PDF document text
    • https://mekivigabu.weebly.com/uploads/1/3/4/0/134096936/bewotij_xavatawamim_zeranukazusuwid.pdfIn PDF document text
    • https://bexitapanirid.weebly.com/uploads/1/3/0/9/130969950/8285527.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424672/normal_60c20f9d47f47.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/bf97bb42-f51b-4564-9b65-24b32c48da23/human_computer_interaction_degree.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/444b18f9-c802-4ffe-ad52-19a68a1bc155/jazzy_select_elite_specifications.pdfIn PDF document text
    • http://memofemovo.pbworks.com/w/file/fetch/144445473/winosofatuw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/28519e59-a279-42fd-85fa-36a180773aaa/fagebu.pdfIn PDF document text
    • http://nilanom.pbworks.com/w/file/fetch/144416835/progress_in_mathematics_grade_2_workbook.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aef9b1ed-52f8-412c-9c35-c0c4ef9b5448/80159545396.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/240feecf-ffd4-4ef6-a00d-3be40ca32aa3/how_to_determine_shear_flow_direction.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/567413d1-16ea-499d-98a6-46fab96d7f2c/7144285774.pdfIn PDF document text
    • http://murenet.pbworks.com/f/rozeleroxi.pdfIn PDF document text
    • http://tulusozofel.pbworks.com/f/letter_d_worksheets_for_toddlers.pdfIn PDF document text
    • http://jotoxipigi.pbworks.com/f/dexisoziduxilug.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ee571170-b9ed-498d-bed7-d8a157a755d0/gufirove.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_off0000f036.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF036 5228 bytes
SHA-256: 5007f3bb46f7a1b7d2359434d8a871851e1f571a18fb53ca8a6a8c20af468461
font_01_sfnt_off000101fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101FE 10840 bytes
SHA-256: 3a7b6344138cd211db016639c9d32017d756de2e5a8dd998d0496162113f57e1