Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c86d548656e9a0d…

MALICIOUS

PDF

73.0 KB Created: 2021-04-16 09:52:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 5262367ced395da0afd9892cb41d8280 SHA-1: 85693ec98ea6d0f554aa4dd51bbc0ff4db69154f SHA-256: 2c86d548656e9a0d52883ae97ee08e276f6b195ae1186df5a08069649071dbf9
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 0.9995

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://zajinet.ru/strik?utm_term=neato+botvac+d4+troubleshooting PDF link annotation
    • https://jotulamopusojo.weebly.com/uploads/1/3/4/4/134465369/mibunezobuwunud.pdfIn PDF document text
    • https://tawuvumiru.weebly.com/uploads/1/3/5/3/135326103/nidofunukope.pdfIn PDF document text
    • http://molotkov.site/xxx_video_playertnyn5.pdfIn PDF document text
    • https://zizeximafebofiz.weebly.com/uploads/1/3/4/3/134369397/fb33a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378171/normal_5fd61f3d94816.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411490/normal_601c7b182662d.pdfIn PDF document text
    • https://xawawamofolapus.weebly.com/uploads/1/3/1/4/131436997/7249577.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475572/normal_6018a6781ff68.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375357/normal_603c7cb699624.pdfIn PDF document text
    • http://static-get.top/tixozopawolenulowis6ev1p.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://lironif.epizy.com/37467722771.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b9c4fa32-caff-4424-97cf-dbb2885f2649/the_girl_with_the_dragon_tattoo_2009_and_2011_difference.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7db56029-172b-4e01-9135-ed6859109639/esl_assessment_test_ontario.pdfIn PDF document text
    • https://4eff3ec4-d147-45d1-be73-876d9e1d0019.filesusr.com/ugd/efb3f0_936a695e8e674d3e913032e5316e466b.pdf?index=trueIn PDF document text
    • https://01c19f78-c7d0-441a-b56a-8672493f87de.filesusr.com/ugd/9d66c7_96b8f7076a5445a4a59d10f08a398d19.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d7d019a2-e104-49f4-b044-9634b029d95f/83347868119.pdfIn PDF document text
    • http://jabaxuzadowepep.rf.gd/molecular_quantum_mechanics_atkins_free_download.pdfIn PDF document text
    • https://3c2b787d-8465-4662-bdcc-bf736d584291.filesusr.com/ugd/8760e7_503eb3e2c5664651a9d3e361a27021c6.pdf?index=trueIn PDF document text
    • https://8eefcaf3-52f5-4123-8be5-b1f0aaeea45e.filesusr.com/ugd/1d3654_252a2d217e374c1aaeebbc6b2fced053.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d84a59b3-d073-449e-8c51-b897f2dc6445/8337974857.pdfIn PDF document text
    • https://29ca30ec-7ad4-487f-8637-d2d67f3a323c.filesusr.com/ugd/10b11f_e53f35bab19d4498b96ff28722b77112.pdf?index=trueIn PDF document text
    • http://dazozelagur.epizy.com/debavoma.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d107.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD107 5340 bytes
SHA-256: 39909cd10432ece709993f1dea7911bea5a4736da5977be03651ff09d65eba21
font_01_sfnt_off0000e332.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE332 10380 bytes
SHA-256: 40dbea202a14b293063377fac8b20cb3f600a865c6a93acabe1f8804bdb2f0c7
font_02_sfnt_off0001069e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1069E 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333