Malicious PDF — malware analysis report

Static analysis result for SHA-256 9af7a1d140b3e82a…

MALICIOUS

PDF

68.7 KB Created: 2020-11-29 19:15:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: d5a1bb84383326ea5dab85b9e780dd69 SHA-1: 219ed09af23c034d9588835c5b7b67148cb71d16 SHA-256: 9af7a1d140b3e82a1b397473d8ff62425b438592b946d71b8543b4043dd0f0eb
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/123?utm_term=mirror+repair+kit+amazon PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4375350/normal_5fa0eeb3e5c58.pdfIn PDF document text
    • https://pibazamigudixo.weebly.com/uploads/1/3/4/0/134000525/dafefox.pdfIn PDF document text
    • https://dinoromakutaxe.weebly.com/uploads/1/3/4/4/134479472/levogejofota-fikemawu.pdfIn PDF document text
    • https://diwosilanula.weebly.com/uploads/1/3/4/7/134765308/5b3ca.pdfIn PDF document text
    • https://falumegobe.weebly.com/uploads/1/3/4/7/134702986/jitodot.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392199/normal_5f922e56e0803.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489853/normal_5fb3346b3a42d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375210/normal_5f99b01e84e27.pdfIn PDF document text
    • https://tubenuluni.weebly.com/uploads/1/3/1/4/131437864/4616595.pdfIn PDF document text
    • https://gevofiku.weebly.com/uploads/1/3/4/7/134759045/7033784.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/42499907-5314-411e-acad-7a7083cb3bf9/french_plan_xvii.pdfIn PDF document text
    • https://s3.amazonaws.com/nafibanefexex/kubota_bx2200_service_manual_english.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/48691bab-36b8-4c77-baa7-d7cd48bc0de4/bilabisumobawutifomaze.pdfIn PDF document text
    • https://s3.amazonaws.com/feborobegibew/sentinel_lymphoscintigraphy_guidelines.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_off0000d2d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2D5 4876 bytes
SHA-256: 7f9b14eef4d4ff0ba1bdd65e97950027501948d9c66df59b08e0291493f2a3c2
font_01_sfnt_off0000e369.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE369 10212 bytes
SHA-256: 4e150cb95dd06d008bf05583b8280e3f365db87b1256d0e6694147b6a78df6cd

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