Malicious PDF — malware analysis report

Static analysis result for SHA-256 81a02fb95e564570…

MALICIOUS

PDF

77.4 KB Created: 2021-03-28 17:52:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: c3e7dedc15e887af00ac30565a17564e SHA-1: c65b281e7eadc5df78d29f869d547e81e81f9f5e SHA-256: 81a02fb95e564570d4f0872afe1a8af8be1a6d3eeffd9f547d1a46a8540f7487
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9997

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://dugedepap.ru/aws?utm_term=is+drinking+flavored+milk+good+for+you PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4366327/normal_605166789fac7.pdfIn PDF document text
    • http://pekibexuvipeve.scienceontheweb.net/pdf_change_text_background_color.pdfIn PDF document text
    • http://goligofalu.medianewsonline.com/best_55_inch_smart_tv_under_500.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368781/normal_6022c3d7bdeb3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4394061/normal_60596b6ef0e9a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://4541bc1c-e35c-4de3-bb44-1f53c3e1a56d.filesusr.com/ugd/68f66e_09c31e70ffaf411ba0b3e4d286fc77cc.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vifusupegiza/70983952738.pdfIn PDF document text
    • https://49432a94-54bc-4d13-9d12-ea41d731e1b8.filesusr.com/ugd/a7c689_e4aa8043dec34060b06cc4cd035cd0de.pdf?index=trueIn PDF document text
    • https://367e539a-c541-4439-991c-4bf2bef2aa7a.filesusr.com/ugd/77d535_ad63a19ce4d04c319f2b9cd5bf1b0690.pdf?index=trueIn PDF document text
    • https://dce579ed-4708-43c3-aaeb-2c76a6268d78.filesusr.com/ugd/944939_3fb096f53c6e41be9baefa463e5d163d.pdf?index=trueIn PDF document text
    • http://sojufuka.atwebpages.com/14265674613.pdfIn PDF document text
    • https://ba789de2-c385-43ee-b32d-a34c698d1993.filesusr.com/ugd/b7082a_1694ed5815934b7fb93c9a110cdca400.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fadedosi/bolutewova.pdfIn PDF document text
    • http://tudojofomako.epizy.com/90380029087.pdfIn PDF document text
    • http://tofezaniv.rf.gd/bsa_sea_base_medical_form.pdfIn PDF document text
    • http://suzujikuluvujov.rf.gd/64907275190.pdfIn PDF document text
    • https://5c817321-7c0c-448b-959d-deb1da9fd788.filesusr.com/ugd/19103d_94b415f8fb2a48c2af861f1ea86a1a08.pdf?index=trueIn PDF document text
    • https://1d78cdce-0032-4a75-b9f1-030f6b068c24.filesusr.com/ugd/32f660_bb1e2dd3eda04a82b346bbee026d28ae.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/netinuwa/strategic_supply_chain_management_books.pdfIn PDF document text
    • https://s3.amazonaws.com/remeranexe/zanaponuxuxete.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_off0000efb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFB0 5388 bytes
SHA-256: 9a2a902c7653b0af6df4eba288ace4e92ec0c0080a96c91a08f158f463d7c1c3
font_01_sfnt_off00010203.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10203 10736 bytes
SHA-256: 39d495e1e7ed6964a558de1c967626dd80fe5ed15388fc073320b45780bd523c

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