Malicious PDF — malware analysis report

Static analysis result for SHA-256 2191fed6ad4c4ab7…

MALICIOUS

PDF

80.2 KB Created: 2021-03-31 10:42:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 0af13807c5706fbd924ca43e99d258cf SHA-1: 799caad4798693e2846ada05c35908f5428ffaa1 SHA-256: 2191fed6ad4c4ab7ae966c8e2f1c3eca3555ab8db0b8d1e7a6770d1ce1a98e5e
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a significant portion pointing to disposable hosting and exhibiting characteristics of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of external URIs and the nature of the link farm suggest an attempt to redirect users to malicious sites, potentially for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://bologen.ru/wix?keyword=read+the+world+amazon PDF link annotation
    • http://imkl-checker.com/23128423079ia705.pdfIn PDF document text
    • http://ergors.space/gastroscopy_report_samplezz9w2.pdfIn PDF document text
    • https://cdn.sqhk.co/kakolutezegu/iabic6x/butipukur.pdfIn PDF document text
    • https://cdn.sqhk.co/karadirimose/IFjeg20/fenuv.pdfIn PDF document text
    • http://zzzmmmmejjj.space/cbse_books_for_class_8_maths4ogs2.pdfIn PDF document text
    • https://cdn.sqhk.co/sudizatase/djbShhj/cheap_weekend_deals_uk.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/07894f08-38c9-40bb-a4e3-53cb74a54412/26412600792.pdfIn PDF document text
    • https://s3.amazonaws.com/gapivegek/forms_of_id_for_employment_in_texas.pdfIn PDF document text
    • https://s3.amazonaws.com/tujeviwakirawu/zolefokevemiwusid.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aea0e925-600e-4155-bdbc-41812d8b730f/how_to_configure_uppababy_vista.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/235af77a-c179-42c3-bb44-c14a9b832a82/65495932436.pdfIn PDF document text
    • https://bbfcab69-cab0-43b8-b861-839d52945da6.filesusr.com/ugd/fa71eb_1924ac89323d4ff69b4e8199b89a3cfa.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4967e060-ce33-4030-a7a9-dead516d5fbf/2834199823.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9bb148c5-f6cd-45a0-aa21-0d56e9c45fcc/72230562419.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0f681abd-5b44-41f3-a7fe-50a98c32161f/audio_driver_windows_10_64_bit_lenovo.pdfIn PDF document text
    • https://6cb1c90e-07cf-4522-b85d-4edd8abc33c8.filesusr.com/ugd/0c41e7_b54fdd376f6746fb8eb742653311b0bc.pdf?index=trueIn PDF document text
    • https://5c3e38fa-bf2d-4cda-bfdc-19e9a39f2227.filesusr.com/ugd/b3ada4_3e94f1b32d39462ab36560b031062f26.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7b93f780-19e8-4d3f-9a52-fbac2a08b6ed/66343815047.pdfIn PDF document text
    • https://s3.amazonaws.com/jamuluvuvava/define_uses_of_clinical_practice_guidelines.pdfIn PDF document text
    • https://s3.amazonaws.com/xazarujokemus/watch_dogs_2_live_wallpaper.pdfIn PDF document text
    • https://814cba0f-f649-4223-bfe6-7884e6e02b9d.filesusr.com/ugd/c1108c_daf641f1078740be81870f6c6ccd026e.pdf?index=trueIn PDF document text
    • https://48936d5e-4b15-4059-a328-ddb12afcc15e.filesusr.com/ugd/173145_eb623e07cd1646cdb510c2f93b9f9f12.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f990.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF990 5036 bytes
SHA-256: 8399193b684987ed28f22cf0ad2a187b9d34b154c21fd6d87229ab04a9051bb7
font_01_sfnt_off00010a9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A9F 11780 bytes
SHA-256: 9677bafb2ad7dd8385534b6f81b760d9f6df3acbaad2b0df6422b05ba7fa1075