Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2430bcf2d85c290…

MALICIOUS

PDF

90.5 KB Created: 2021-04-11 12:06:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 20df14ceaff4bccba072a1519341abc2 SHA-1: dad49076151f9c5bed621eb3ea10305dfd80da71 SHA-256: b2430bcf2d85c2901b2c8863248270b87ec47bba945d22f53955fb59afd620a7
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://zajinet.ru/strik?utm_term=summer+waves+pool+18x52+big+lots PDF link annotation
    • https://kekugijofer.weebly.com/uploads/1/3/5/3/135321092/4499197.pdfIn PDF document text
    • https://bitekiparoduj.weebly.com/uploads/1/3/4/0/134017536/1700418.pdfIn PDF document text
    • http://lojapidabud.mypressonline.com/87305583895.pdfIn PDF document text
    • http://zozavelomidabi.scienceontheweb.net/autosomal_dominant_vs_autosomal_recessive.pdfIn PDF document text
    • http://zatoxuvisovapuf.sportsontheweb.net/newarokiwinixu.pdfIn PDF document text
    • http://garobunatuxovi.scienceontheweb.net/the_chocolate_war_movie_cast.pdfIn PDF document text
    • https://dadixuva.weebly.com/uploads/1/3/4/0/134018012/poxati.pdfIn PDF document text
    • http://zumepaposakuf.scienceontheweb.net/13760024810.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/f1c61cd2-1b1d-42da-9b52-85553f573612/64972944410.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e3efef74-b1cf-460d-a5c8-554b4511accc/63516501105.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0d397ccc-cc1b-433b-8e63-ed4e9e20015f/espn_the_last_dance_trailer_song.pdfIn PDF document text
    • http://jisunopesaluzi.atwebpages.com/ethical_leadership_questionnaire.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6a044265-0815-4588-84d0-973816895323/autocad_2015_download_size.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/81042ff9-df9a-4417-a429-97646b01bc27/58240678210.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c0c0de91-0038-44eb-b013-792afdbd22b2/27966542634.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4fb58543-2e58-4a55-a98c-f2315aab6b40/21628525630.pdfIn PDF document text
    • http://faxevimisosideg.myartsonline.com/83589822523.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8538c46c-744d-46c9-a0fe-8005c2e73905/2016_honda_trx_500_service_manual_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d14e6184-747a-43b3-8792-e37dc7a9400e/what_were_major_events_in_the_renaissance.pdfIn PDF document text
    • http://wovuluvoju.onlinewebshop.net/38175254693.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_off00011c06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C06 6104 bytes
SHA-256: f2a616479139f2478dc7190d2d7b52631a37cb29c1bde9fdf1daef4c456bc179
font_01_sfnt_off000130cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130CF 12756 bytes
SHA-256: c874509966c91d0f1b410d054575040adf3bdc9eb0b7c68cd22b2cec40e66d08

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