Malicious PDF — malware analysis report

Static analysis result for SHA-256 26fd6ef56cd0121c…

MALICIOUS

PDF

78.8 KB Created: 2021-03-13 17:44:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 54b44f07e23bb45e6cc27819a218d29b SHA-1: 51fc54446d8bbb9888ea507eeeb2c7f16f344242 SHA-256: 26fd6ef56cd0121ce3cd7ebe7e1d2d025ec5b169b1faa0650195098f9194c7c0
186 Risk Score

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 0.9994

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://gimoguvi.ru/wix?keyword=christmas+decorating+crossword+answer+key PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4494136/normal_5fd9785841496.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491945/normal_60348ebde5be0.pdfIn PDF document text
    • https://bezujopejot.weebly.com/uploads/1/3/1/6/131606295/zolir-xovuvolelawi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493266/normal_5fd28237153fa.pdfIn PDF document text
    • http://zesegalos.scienceontheweb.net/brunner__suddarths_textbook_of_medical-surgical_nursing.pdfIn PDF document text
    • https://metogixum.weebly.com/uploads/1/3/0/7/130775033/77b0dadf2.pdfIn PDF document text
    • https://xojerajap.weebly.com/uploads/1/3/1/3/131384359/numufudizub.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425009/normal_6033d3d2d80a5.pdfIn PDF document text
    • https://zejizatuziw.weebly.com/uploads/1/3/0/7/130739720/f2695ad0fa14b.pdfIn PDF document text
    • http://lorewipa.scienceontheweb.net/spirit_blossom_thresh_bundle_price.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4497078/normal_5ffeb393f10ad.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://42190e62-4dca-482d-a077-ae7b222d7779.filesusr.com/ugd/b91392_eb26932d71cd42e5ae7a6358c732a6ec.pdf?index=trueIn PDF document text
    • https://5d3a357a-25b2-4459-9cd8-210b235f7b36.filesusr.com/ugd/45e30f_91b7a313541547829d3adcdf64bc1180.pdf?index=trueIn PDF document text
    • https://ddf64d59-5240-4154-9987-17dfc28e22c7.filesusr.com/ugd/cec570_793ab82080ce442bb200ae0790bae977.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xapijifas/nizaroxevi.pdfIn PDF document text
    • https://02796127-04ec-4c85-b270-c6f7310ebb18.filesusr.com/ugd/ce0e6d_f5b43e05c35b44d9b7236c79cb56b362.pdf?index=trueIn PDF document text
    • http://jabodegodonirad.atwebpages.com/dry_adiabatic_lapse_rate.pdfIn PDF document text
    • https://13cfbe10-32e4-4d7a-9072-8dbd3280e6b8.filesusr.com/ugd/994e9e_a1959803878c4b3eb80a6e6f57f2b5e9.pdf?index=trueIn PDF document text
    • https://83d7d1d1-3661-4158-a2cc-78aa4aa39d08.filesusr.com/ugd/163759_28486c68864242acb99e0e4c5b049dd3.pdf?index=trueIn PDF document text
    • https://ec679cc6-872a-45a8-b2fd-b1bc8f6ddb77.filesusr.com/ugd/d1d005_be7046a40c5246b2921a942da09e7b83.pdf?index=trueIn PDF document text
    • http://xuvekixofeku.onlinewebshop.net/24542280850.pdfIn PDF document text
    • https://s3.amazonaws.com/sejakopa/spotify_windows_8._1.pdfIn PDF document text
    • https://0dd4521b-3e41-4083-9bcc-807cce03ae78.filesusr.com/ugd/cfe2e9_5c36c25e38a946ad96368513f343ccee.pdf?index=trueIn 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_off0000f644.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF644 5484 bytes
SHA-256: 221ac6674ba41443f39808b91bbf3ca5f8330e77eea31f02535226315932cc91
font_01_sfnt_off000108cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108CB 10856 bytes
SHA-256: 3ac1d3d14a0481c896ac5740d179a7fb630bb4ddd4b7a7db59b8ef6892a53588