Malicious PDF — malware analysis report

Static analysis result for SHA-256 7014689a78bcb454…

MALICIOUS

PDF

77.1 KB Created: 2021-03-24 00:00:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 9d3627a99f21a8e0a6d16871fa2b2ef0 SHA-1: 7539ff4b6e723058b29cf84dadad59dd35bbb99b SHA-256: 7014689a78bcb454608803d13bfcc8bd4590ebe8fd5a6f02f8e20f6b5eb2d628
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable domains and hosted on services like Weebly and s3.amazonaws.com, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point towards techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://golowaki.ru/123?utm_term=poweredge+mx740c+spec+sheet PDF link annotation
    • https://bonubowagadeki.weebly.com/uploads/1/3/4/5/134506782/4ba5fd.pdfIn PDF document text
    • https://fomodaduvi.weebly.com/uploads/1/3/4/7/134700625/gibosusadaduk_wokanegavixik_nowise_pagubetetavinuf.pdfIn PDF document text
    • http://lololoj.sportsontheweb.net/vegurab.pdfIn PDF document text
    • https://voberugupov.weebly.com/uploads/1/3/4/4/134496708/56343.pdfIn PDF document text
    • http://bowuvudofi.scienceontheweb.net/how_to_annotate_with_apple_pencil.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407081/normal_5fe3de38c97a7.pdfIn PDF document text
    • https://famuzupowaja.weebly.com/uploads/1/3/1/4/131406758/3663629.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4461232/normal_5ffcb487d7c0e.pdfIn PDF document text
    • http://fuxezaboxekave.scienceontheweb.net/topogepesoveban.pdfIn PDF document text
    • http://pojapusevipuzu.mypressonline.com/specials_scott_westerfeld_quotes.pdfIn PDF document text
    • https://katalulipof.weebly.com/uploads/1/3/2/7/132710678/9099619.pdfIn PDF document text
    • https://nolutoxut.weebly.com/uploads/1/3/4/6/134683805/zenalosevode.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494452/normal_600c562229665.pdfIn PDF document text
    • https://telanadiv.weebly.com/uploads/1/3/4/4/134495792/f6a851fe23a4b20.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/sebunuzu/buforadel.pdfIn PDF document text
    • https://s3.amazonaws.com/befafuni/crystal_edit_reports.pdfIn PDF document text
    • https://s3.amazonaws.com/libeganot/how_to_reset_ao_smith_electric_water_heater.pdfIn PDF document text
    • https://s3.amazonaws.com/rizezobabub/how_to_use_bucket_truck.pdfIn PDF document text
    • http://fedonefekipide.myartsonline.com/4457162428.pdfIn PDF document text
    • http://judiserod.onlinewebshop.net/6794602793.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_off0000ed1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED1D 5716 bytes
SHA-256: 6fa6acedcc2590843788d70c962e858c3c19ed6022f3865dafa044401d9f6840
font_01_sfnt_off0001009b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1009B 11320 bytes
SHA-256: b1d4531a06631dc6069dd4f72c9c314ed01b8d05b5fd4c98c04e71a37a04b10d

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