Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f7ce6666732d557…

MALICIOUS

PDF

87.3 KB Created: 2021-03-27 16:39:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 8c28744ac34ff57ef133e5b96679a10c SHA-1: 7f150c706c7f9ba869149e0cf389d591934a03b2 SHA-256: 9f7ce6666732d5579f07a6dc33582f211e13b424397722923e204e8d7056d3ed
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious. It contains numerous external URIs, many pointing to disposable hosting, suggesting a link farm or SEO poisoning attempt. The primary malicious URL identified is https://bologen.ru/award?keyword=mark+twain+cannibalism+in+the+cars+pdf, which likely serves as a lure to distribute further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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
  • 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://bologen.ru/award?keyword=mark+twain+cannibalism+in+the+cars+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4383695/normal_603b215080246.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367668/normal_5ff77346e6287.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445130/normal_60554c55522ea.pdfIn PDF document text
    • http://klossheff.xyz/dukilalufukorupazolimelovytx4d.pdfIn PDF document text
    • https://cdn.sqhk.co/xarozowuzosa/iehiKhf/nawojutuwakureroded.pdfIn PDF document text
    • https://cdn.sqhk.co/gusiloxi/jbWogh8/qvacall_base_de_datos_2020.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484993/normal_5fe7d0f187b9d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489983/normal_604efe554ab7d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418558/normal_600b1680e9926.pdfIn PDF document text
    • http://setofexperience.site/analisis_numerico_burden_8_edicion424pv.pdfIn PDF document text
    • http://flowerport.market/kelulemeshpo2b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405895/normal_601fbb8ee616d.pdfIn PDF document text
    • http://saratov.ooo/vivekizosuworivewupqyk1k.pdfIn PDF document text
    • https://cdn.sqhk.co/moxoxitij/FuGEdjb/planet_zoo_sandbox_vs_challenge.pdfIn PDF document text
    • http://ryukzak.digital/buchwald_couplingar0dk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465006/normal_6015eef8d0059.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/4c19bb24-7745-41b4-b2dd-d4e399b9fdb0/maverick_et_733.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba82cece-4cb5-4e87-9737-231e24272ebb/how_to_connect_jabra_elite_75t_to_macbook.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/321fabb0-8c2c-4048-9fda-82e29e9d8071/julasi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba97b3ef-ac76-4a63-ac6b-9371385a5859/educational_psychology_case_study_examples.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c25b4044-6662-4566-9bf7-6186a557fe9e/kesumogijukur.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ff97da4c-0a22-4a42-a35c-12593b0e4ed1/99486011961.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0e98f433-6366-4e87-ab0f-4582867b76d2/what_is_the_polar_coordinate_system.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/371423ce-c063-4d71-aaae-646b106756d3/44494364628.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/626c4d63-f8c0-42bc-851a-9e2fd0a42774/sipulal.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_off000118cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118CD 5696 bytes
SHA-256: e1d57b2f77ecae78c83a71b632fb3731eb3faa2093079e26509dd2a999cab232
font_01_sfnt_off00012c21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C21 10340 bytes
SHA-256: 014f9a20d6057b316da593a371e60a41d84cf23b23fe2af1c0f8e262a7cc228a