Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e6cb90cffe9f41c…

MALICIOUS

PDF

83.6 KB Created: 2021-03-18 13:57:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 2359855af7af10efd56b16d8370e893f SHA-1: 2eec05b1de454388ea10764273a165a3d5c4bbfc SHA-256: 8e6cb90cffe9f41c1516322563ee13b13f97deed6928f541d54fbaca05dee8c3
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://lozipotod.ru/aws?utm_term=dell+e6410+enter+bios PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4424991/normal_6018f512769d6.pdfIn PDF document text
    • https://terajorekefiko.weebly.com/uploads/1/3/1/4/131408772/pamixakoxowej-gajipixapo-bebewozakafeg-vawolawoni.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462708/normal_5ffa3bb3c7492.pdfIn PDF document text
    • https://lafadulow.weebly.com/uploads/1/3/4/5/134591129/jobusuw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417205/normal_604ec41c31883.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448556/normal_5fddf7af5f691.pdfIn PDF document text
    • https://mirodogewe.weebly.com/uploads/1/3/4/8/134861862/zapimevelafimume.pdfIn PDF document text
    • http://optamorem.com/nibotubilesijozakuknm70n.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414331/normal_60497b0622293.pdfIn PDF document text
    • https://gemiletux.weebly.com/uploads/1/3/2/6/132681217/6dd3343c.pdfIn PDF document text
    • http://scarcebook.com/zitefujotazomebawad5jinv.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/255874d9-1e37-492e-b867-c5c074cbadf1/which_electric_smoker_is_best_for_the_money.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/64b1b07b-4505-4925-9e75-fb6e9bb0b3e7/rujuzorijazodagutosizigu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ccf15eda-7861-40ba-b645-fe5f1c53e6b2/54073535134.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/04642416-03a7-4b2b-b438-6060407ae46e/nimuvuwazidepisazozozogaf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b038cd33-a7a0-4b13-a12e-80d4d20221d5/linear_algebra_hoffman_solutions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6b7abcac-63da-4464-89a1-79801368b5bb/27535042898.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ab720cdc-0489-46b3-b87e-c1fcf6122b16/80909434045.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/16975820-df16-4074-bf06-7b487554f0be/duxediwu.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_off00010a4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A4F 5044 bytes
SHA-256: c67814ff39e0da16ea8b398f9ec93dc273dcf29d31aefe108cd117e3453cf860
font_01_sfnt_off00011b92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B92 10968 bytes
SHA-256: d37209d06e3fa84aaf82fbee5f0b1cb0645d53637e88911c5d40751f15126576

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