Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf79524e477574aa…

MALICIOUS

PDF

116.2 KB Created: 2021-03-25 13:36:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: ae037f5dcda5008e0c70fb4b1ede8bd0 SHA-1: 2a94905d3c7ef7df3ddb18f539d423ae911188f1 SHA-256: bf79524e477574aaac4b025c3d82064dc0290e01101a3fa9cfa815969d7f749d
184 Risk Score

Malware Insights

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

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 and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/123?utm_term=creative+writing+exercises+for+beginners+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4367297/normal_5fe6b2b984aec.pdfIn PDF document text
    • http://rifijetuvijilam.medianewsonline.com/64272882308.pdfIn PDF document text
    • http://wokodanib.getenjoyment.net/zaluwanaza.pdfIn PDF document text
    • http://pepujolajerikur.66ghz.com/pawobeweditoxigule.pdfIn PDF document text
    • http://gifuketedep.22web.org/laviwutugazediwo.pdfIn PDF document text
    • https://sizamuvexiluti.weebly.com/uploads/1/3/4/6/134644091/5847269.pdfIn PDF document text
    • http://ponemofetu.scienceontheweb.net/neoliberalism_and_globalization.pdfIn PDF document text
    • https://puguguduzi.weebly.com/uploads/1/3/0/7/130739618/xokoripokaxuwikaf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476434/normal_6022696dcdb15.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413977/normal_603ed73462a45.pdfIn PDF document text
    • http://sawemawe.mywebcommunity.org/how_to_put_baby_in_graco_snugride_35.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470985/normal_5fe4dad720ac3.pdfIn PDF document text
    • http://fajujefa.getenjoyment.net/siletutumenixovetajigot.pdfIn PDF document text
    • https://dobamadolexazi.weebly.com/uploads/1/3/4/4/134478964/zonenibijuvin_koruxizepilapog.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381081/normal_5ff8af06aa4b3.pdfIn PDF document text
    • https://mirinojasuri.weebly.com/uploads/1/3/4/5/134588432/e6cd3cb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://bd7a0a6f-bbfd-49cc-ba41-c3f2778102d9.filesusr.com/ugd/9ea91e_afe2dc98f81a433c87f57f081ed1b4cd.pdf?index=trueIn PDF document text
    • http://duzebufulumaw.epizy.com/evolution_and_geologic_time_worksheet_answers.pdfIn PDF document text
    • http://folalolitawos.epizy.com/ncss_social_studies_definition.pdfIn PDF document text
    • http://gixezatisebozus.epizy.com/fikeforixitinevewowimudap.pdfIn PDF document text
    • http://favugilodufim.epizy.com/pefapidoxijugisamizuwuje.pdfIn PDF document text
    • https://afa032df-bfad-47da-a9c8-c79260182993.filesusr.com/ugd/6f9b04_fac7eb41c2134ef28732469fca03d750.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00017064.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17064 5556 bytes
SHA-256: 1f8318f1fefaf9a79149d70aae3032de81c48ed5c220e31fac54d45f0c9fba7c
font_01_sfnt_off0001836c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1836C 12268 bytes
SHA-256: 6a8d00df91de3a060d13125f4708ca400c3fe942351c79bf4eb1f2ba3a2f6f19
font_02_sfnt_off0001ac5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AC5C 16036 bytes
SHA-256: 35d3440dae1ebc896564e4e6f70ea95aa3a30a1ac603c7fffbb21b68b8b72e2f