Malicious PDF — malware analysis report

Static analysis result for SHA-256 b244124b0be4c83f…

MALICIOUS

PDF

68.6 KB Created: 2020-11-13 20:02:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 6ac4048f3826a6d43aced8d0e38d0f0e SHA-1: d70b46ab2a7906a1232efafdd86ba49b1377abcf SHA-256: b244124b0be4c83fb012ccc0418dc41facb9e3dff0af992250f53a45e7154253
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was identified as malicious by ClamAV and an ML classifier. It contains a significant number of external links, many pointing to disposable hosting services, indicating a link farm designed to distribute malicious content. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic strongly suggest a phishing or malware distribution attempt.

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://traffnew.ru/strik?utm_term=medical+school+essays+that+made+a+difference PDF link annotation
    • https://xenolonaloku.weebly.com/uploads/1/3/4/4/134458783/efbdf5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380393/normal_5fa5e211c7586.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380213/normal_5f9049d0522b8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414335/normal_5f99b2d81d8d3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370737/normal_5f93cfa7f1ca1.pdfIn PDF document text
    • https://doxediseweroz.weebly.com/uploads/1/3/4/6/134634010/5188293.pdfIn PDF document text
    • https://luzofimufabo.weebly.com/uploads/1/3/4/5/134590143/f637f4546a6cd38.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373779/normal_5f8bc1d3ab4b9.pdfIn PDF document text
    • https://bubixoduxufito.weebly.com/uploads/1/3/1/0/131070588/barinesex_mafipebovov_bonorawa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413363/normal_5f9f23ffefac9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472486/normal_5fa6e7514f354.pdfIn PDF document text
    • https://jikeberu.weebly.com/uploads/1/3/1/8/131857846/9724312.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374978/normal_5f8aebbe12d31.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/e25e6ee7-2fc0-47e4-9f10-dda5d8e11ac2/juvowajijudaso.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c681851c-22d2-45ea-b88f-e43703b05557/gore_gore_mukhde_pe_mp3_song_free_download.pdfIn PDF document text
    • https://s3.amazonaws.com/pusori/jisufatovevexorusal.pdfIn PDF document text
    • https://s3.amazonaws.com/banula/autodesk_apk_uptodown.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_off0000cfdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFDD 5368 bytes
SHA-256: c5b0a119314594ec64fbd7228d558e11bc0e5eeb1c294864e758a94bae6f92d4
font_01_sfnt_off0000e205.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE205 10280 bytes
SHA-256: 15063caa3fe9cd3fc29e85a156d68f8358bda5b0988ef35497bfe112d86121fd

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