Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa86986e7021c457…

MALICIOUS

PDF

75.9 KB Created: 2020-11-25 21:44:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 7df00fd43ba634db8a6eaabc14a43b2c SHA-1: 6e7191783f3af668317028146be85fc80fce0213 SHA-256: fa86986e7021c457078031142e342a61c64743f0346bbcde68836963880fc183
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 0.9998

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://trafffe.ru/strik?utm_term=math+extended+essay+structure PDF link annotation
    • https://nebakeji.weebly.com/uploads/1/3/4/6/134649015/31b6b491d8a1.pdfIn PDF document text
    • https://rusokupos.weebly.com/uploads/1/3/4/4/134468665/lixine.pdfIn PDF document text
    • https://xoxamotanu.weebly.com/uploads/1/3/4/6/134653835/kelixinelofisav_natubisude.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380707/normal_5fa120977175d.pdfIn PDF document text
    • https://sufimaxunexex.weebly.com/uploads/1/3/4/3/134345405/48f613b3b47d59.pdfIn PDF document text
    • https://xeludelibiw.weebly.com/uploads/1/3/4/3/134371965/1186217.pdfIn PDF document text
    • https://xaniwunedevivat.weebly.com/uploads/1/3/4/4/134470123/metokarur-tabisikurek-vuparufolata-robal.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382789/normal_5fa814a85499a.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
    • https://uploads.strikinglycdn.com/files/0cf2ed14-04c0-49e7-ada1-51046b08b309/407056908.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/173e403a-e6ff-40db-b9ad-980f9091a368/67137747367.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9e466c12-b7cb-4c34-a91f-0bb79efca3d8/29755711158.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/acc9370b-39d7-4416-8a39-2c3913b9d00f/zudoxupisogilerikifuwexu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/db333b48-86ba-41af-870a-231664c2bb9d/magruder_s_american_government_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f6143999-3838-4a57-a407-d8af105b1012/66380522651.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e6fdcacd-e542-4f54-a77a-8089b9d6f235/7450764930.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e072.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE072 4892 bytes
SHA-256: c4bb0556e66ea3685d648b77e41a3c6385cdbbfb9fa3c5fb2afdcfc4ce0d30c0
font_01_sfnt_off0000f10c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF10C 10452 bytes
SHA-256: 787a11ebb12a7f88155846f98943865c8814d19b7dcd18bc717fbd22b2efce54
font_02_sfnt_off000114bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114BC 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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