Malicious PDF — malware analysis report

Static analysis result for SHA-256 08b3d19fbb4f680d…

MALICIOUS

PDF

104.0 KB Created: 2021-03-09 17:20:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: b051c6b8c3b51f30f64b53965fce2e3e SHA-1: 468d11c5f8557b86a20e6d96b01f72251e9ece47 SHA-256: 08b3d19fbb4f680d2839c88a685a3b74c17eb9960ae32cf86e50c511cfc9630a
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm used for SEO manipulation or phishing. One prominent URL, https://ponafet.ru/strik, is likely part of the malicious infrastructure. The document body, though heavily obfuscated, appears to be a lure related to a historical query, intended to drive traffic to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://ponafet.ru/strik?utm_term=what+type+of+government+did+the+soviet+union+have+during+ww2 PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4457847/normal_5fce359d2e3b1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384039/normal_60178473a70ab.pdfIn PDF document text
    • http://unityfree.xyz/61924797894qbtas.pdfIn PDF document text
    • http://luminar4-download.xyz/bavasawogemagojedepadudumpt4qs.pdfIn PDF document text
    • http://allerlo.xyz/is_h2co3_a_strong_weak_or_nonelectrolytehcbfz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407316/normal_6021959e90685.pdfIn PDF document text
    • http://exampl1214.com/63886978145a6ir0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457862/normal_60468fd942b08.pdfIn PDF document text
    • http://gofidiva.iblogger.org/jakibazetakomavukufewem.pdfIn PDF document text
    • http://medway24.com/askip_apk_ioshz2jm.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://2aa89031-56ac-4de1-b828-aabe99840ec8.filesusr.com/ugd/cf14a4_b965483b6a48469984da3aea5682f57c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0b79f026-7ccc-450c-b0a2-b99c20ac8a9e/las_medias_de_los_flamencos_cuento_completo.pdfIn PDF document text
    • http://jumezezufa.rf.gd/85851874109.pdfIn PDF document text
    • http://vizawog.epizy.com/vcenter_server_6._0_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9338b5e5-49b0-4377-91a9-3ebb235dea84/how_many_carbs_are_in_a_medium_vanilla_iced_coffee_from_dunkin_donuts.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d95e1979-3369-4919-b7b5-d077a155911d/pixokibubom.pdfIn PDF document text
    • https://828c6a01-da61-4814-986a-f72e64f4f334.filesusr.com/ugd/cdfdba_c2c342470ea9428c8f0cc08673be70ad.pdf?index=trueIn PDF document text
    • https://ae26bae5-b1f3-4fb2-a0ba-5d2f2d23988c.filesusr.com/ugd/aec2ea_7c278fce46e5470989d9fbf2a22ef383.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f6b056db-d725-4b83-874a-d5d2ac20301e/is_the_2015_mustang_ecoboost_worth_it.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4e953ac5-b162-4573-a0e4-93509abab189/99891138472.pdfIn PDF document text
    • https://ce55c564-0e79-48ac-bd91-a034cff8554b.filesusr.com/ugd/bd1fc0_c58db4b6b95c43fdbc898337f467771a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/24bc594c-5291-4116-8ce6-064c393403e6/why_did_the_agricultural_revolution_contribute_to_start_of_the_industrial_revolution.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_off00014cbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14CBB 5820 bytes
SHA-256: 070ebc94981f4384972e4176cbe3ccfb313b90c69872c32407cde0df776f4d95
font_01_sfnt_off00016091.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16091 15636 bytes
SHA-256: bbd8be52731a828cbd1c9c513772c6fb7437b4d0d200d8ca5906dd348e41a5e2