Malicious PDF — malware analysis report

Static analysis result for SHA-256 efdc5daf9ca86e0b…

MALICIOUS

PDF

77.5 KB Created: 2021-04-16 15:32:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: afeca317d2c4105d3b4fbabf9d82b601 SHA-1: df2253537849cd802e20f8c500a4ea13e87a1bbc SHA-256: efdc5daf9ca86e0ba59eb7d5834768b01e368784cbc4538b10695ec05a4d147b
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was identified as malicious by both ML classification and ClamAV, flagging it as a phishing trojan. It functions as a link farm, containing numerous external links to other PDFs hosted on disposable domains. The primary purpose appears to be SEO manipulation or the distribution of further malicious content through these linked PDFs.

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://jumiwimov.ru/strik?utm_term=what+is+the+story+goodnight+moon+about PDF link annotation
    • https://jadilibetaz.weebly.com/uploads/1/3/4/8/134871175/5985e69e385.pdfIn PDF document text
    • https://pefobasor.weebly.com/uploads/1/3/4/1/134131397/1213032.pdfIn PDF document text
    • https://cdn.sqhk.co/kigaratak/eLmgeQc/vewenafifixakubum.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476285/normal_60187c580488c.pdfIn PDF document text
    • https://zaloposigino.weebly.com/uploads/1/3/0/7/130739621/48c9d10.pdfIn PDF document text
    • https://cdn.sqhk.co/jogeguzotire/sZOhegc/oscar_fish_cartoon_movie.pdfIn PDF document text
    • https://pemejugaxopuled.weebly.com/uploads/1/3/4/7/134749032/7efd7af14557.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368240/normal_6014c2dd9864b.pdfIn PDF document text
    • https://tazerodine.weebly.com/uploads/1/3/4/5/134598813/vegamemilixonigemode.pdfIn PDF document text
    • http://nuvagefo.medianewsonline.com/jet_airways_cabin_crew_interview_questions_and_answers.pdfIn PDF document text
    • https://xidelora.weebly.com/uploads/1/3/5/2/135296398/250796.pdfIn PDF document text
    • https://cdn.sqhk.co/mewovegid/ibibhjX/naxujav.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419236/normal_5fd19ab125eb8.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://solugivewatewa.myartsonline.com/complications_of_inferior_alveolar_nerve_block.pdfIn PDF document text
    • http://tekefugenira.epizy.com/menimusolufe.pdfIn PDF document text
    • http://nuwadolonopip.onlinewebshop.net/vazipafularotozafunowuv.pdfIn PDF document text
    • http://lumijezemoto.rf.gd/organisational_structure_chart_templates.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_off0000e3c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3C3 5344 bytes
SHA-256: c1d0989eb7cad97d2bad952d5448e636f8bf3a05c22ffad7a3e4314eac4cc067
font_01_sfnt_off0000f5cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5CC 10836 bytes
SHA-256: c9d7e3550cd7663652cbf4fcb1a505d1f68e9d35d131cc42ab6a4edf2545fb02
font_02_sfnt_off00011ab1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AB1 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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