Malicious PDF — malware analysis report

Static analysis result for SHA-256 a76f2b4c7316328a…

MALICIOUS

PDF

76.2 KB Created: 2021-03-11 21:42:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 3c4f4cc6cbbfc734f86ed69bf901a475 SHA-1: 9bfc7dbc81cab857c34d5cb2eeb00e43d747378e SHA-256: a76f2b4c7316328a0b0cb8bf50af30f9d18e7a6e18960865c34f18036da0df69
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 functions as a link farm, containing numerous external links to other PDF files hosted on various domains, some of which appear to be disposable or used for SEO spam. The primary external URI observed is 'https://dugedepap.ru/award?keyword=toyota+auris+2020+manual+pdf'. The document body is heavily obfuscated and contains metadata indicating it was generated by wkhtmltopdf.

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://dugedepap.ru/award?keyword=toyota+auris+2020+manual+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4383464/normal_603eba46d30a4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367271/normal_60303d3597918.pdfIn PDF document text
    • https://cdn.sqhk.co/novozefox/jxtGgiG/roadrunner_desert_facts.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4494875/normal_6002753c4d78f.pdfIn PDF document text
    • https://guxitubekin.weebly.com/uploads/1/3/4/2/134267073/5871081.pdfIn PDF document text
    • https://sakobapo.weebly.com/uploads/1/3/3/9/133999770/9ddb027.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417834/normal_60215835c8c30.pdfIn PDF document text
    • https://cdn.sqhk.co/nasubivapu/hjid7ja/78200878961.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371266/normal_6012bf71f3bc8.pdfIn PDF document text
    • http://kapovulup.mywebcommunity.org/41416543294.pdfIn PDF document text
    • https://fenawivo.weebly.com/uploads/1/3/4/0/134000055/zusexinet.pdfIn PDF document text
    • http://rupaduwovuw.getenjoyment.net/where_can_i_donate_furniture_in_seattle.pdfIn PDF document text
    • https://xisiwazebisa.weebly.com/uploads/1/3/4/7/134758569/9913061.pdfIn PDF document text
    • http://rufujatev.iblogger.org/rudram_chamakam_malayalam.pdfIn PDF document text
    • http://papogemedafudak.22web.org/naneseb.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/256e9350-ea0a-471a-82ff-e18f5c4124b6/34188996505.pdfIn PDF document text
    • http://dogabofeki.epizy.com/esperanza_renace_las_almendras_resumen.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7763b642-eea3-4eaf-9e77-a8101af8af59/what_does_it_mean_when_service_airbag_light_comes_on.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_off0000ed45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED45 5512 bytes
SHA-256: cb176bd60b3b087690b053394d0cffcfde50d2419877101db6ee021f5bae553b
font_01_sfnt_off0000fff2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFF2 10564 bytes
SHA-256: 41c7faa016aa4d3937f9550df14bf5fa76e85b045de38783c014446c086d5f51

Open this report in the interactive analyzer, or submit your own file for analysis.