Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca514b88e6a7d8a6…

MALICIOUS

PDF

74.6 KB Created: 2021-04-14 22:58:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 9882f459773e27d7cddfd405cdef1e0a SHA-1: b11aefe912db9c646bb6ab70fb3aa44d643840b8 SHA-256: ca514b88e6a7d8a6567b933a5fb9697815bc94d4943fb7fb94d6b058fb1303bc
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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ponafet.ru/strik?utm_term=reclaimed+wood+bar+table+set PDF link annotation
    • https://cdn.sqhk.co/nupozifulija/W6hbljg/17316293377.pdfIn PDF document text
    • https://cdn.sqhk.co/posukomokufi/ihwaajh/wipavawajojixidakek.pdfIn PDF document text
    • https://toripifisesu.weebly.com/uploads/1/3/4/3/134367164/9252357.pdfIn PDF document text
    • http://nutosuvitiraj.scienceontheweb.net/diccionario_italiano_espanol_en_linea_gratis.pdfIn PDF document text
    • https://cdn.sqhk.co/lewoxiguj/gjidhdM/manib.pdfIn PDF document text
    • http://vofigasu.medianewsonline.com/62513294377.pdfIn PDF document text
    • https://cdn.sqhk.co/surudije/jbChdv4/norozif.pdfIn PDF document text
    • http://sopesukenapad.scienceontheweb.net/temperamento_e_caracter.pdfIn PDF document text
    • https://cdn.sqhk.co/janonaset/jcifTih/rikibetawife.pdfIn PDF document text
    • https://kewekekonuv.weebly.com/uploads/1/3/4/7/134732265/jikalanabupaj.pdfIn PDF document text
    • http://bumasujofoj.getenjoyment.net/93506772736.pdfIn PDF document text
    • https://lutomired.weebly.com/uploads/1/3/5/3/135316507/1959040.pdfIn PDF document text
    • https://cdn.sqhk.co/wifopuzuxiba/jhnDgej/13202288638.pdfIn PDF document text
    • https://cdn.sqhk.co/pizokifuxe/gjsV8UY/tiwevamefova.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/029feca4-31f3-4b2d-b8b4-36076c541754/9560607318.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ce0d3e07-d9cd-45cb-97d1-73d5ea9d025a/aswb_clinical_exam_study_guide_2019.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3f65eee0-f694-4583-ac85-d3823f03e6b0/kizejakuno.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7b99247a-c9c5-4e2d-aa4f-2ca0dd4aadcc/adobe_premiere_pro_rendering_stuck.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e40c8f2b-d9cb-47ba-b169-1442af597045/last_quote_from_a_river_runs_through_it.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d63e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD63E 5008 bytes
SHA-256: aff1d85786a28d1072a50231770d453751e98959d10b1c708c67b57f532db63b
font_01_sfnt_off0000e754.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE754 11692 bytes
SHA-256: 2bd09b3d17ae4a75b0b58e1211804b069807e6f0417c172ea2693ad4e01daead
font_02_sfnt_off00010f59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F59 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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