Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7151644bdee9a63…

MALICIOUS

PDF

73.2 KB Created: 2021-03-07 16:49:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: ac7f11e2345efe4d436d6275f8ab6765 SHA-1: dbc7dbe7e4514b8bcc9c909aba01b14e5143af4b SHA-256: c7151644bdee9a637f9168b9f1bc6b88ff99da414939c99d9f6141b7d332dd86
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting services, indicating a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or SEO abuse. While no scripts were explicitly extracted, the PDF structure and numerous URLs suggest it's designed to redirect users to potentially harmful content.

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://vilenefex.ru/strik?utm_term=djms+procedures+training+guide PDF link annotation
    • https://zotorakiv.weebly.com/uploads/1/3/0/7/130739478/9111314.pdfIn PDF document text
    • https://sawisede.weebly.com/uploads/1/3/2/6/132681865/datetififexafug-savizawijezosa-xojosukidigu.pdfIn PDF document text
    • https://mobisikude.weebly.com/uploads/1/3/1/6/131606420/vejimi_xozodiguvogesom.pdfIn PDF document text
    • http://monoga.space/khao_sok_national_park_travel_guideqzkj3.pdfIn PDF document text
    • https://dowozazufexu.weebly.com/uploads/1/3/4/6/134606261/mewapala.pdfIn PDF document text
    • http://umdtheatre.ru/tabela_simples_nacional_anexo_iii_2020zkddy.pdfIn PDF document text
    • https://nazuvunu.weebly.com/uploads/1/3/4/4/134438845/tarivam-sebom.pdfIn PDF document text
    • http://jsexj.fun/70232115538k6mnr.pdfIn PDF document text
    • https://topalezomezo.weebly.com/uploads/1/3/4/3/134305389/3988432.pdfIn PDF document text
    • https://xepovilebifupu.weebly.com/uploads/1/3/6/0/136086158/2316325.pdfIn PDF document text
    • http://zafimapi.22web.org/bowflex_sport_review.pdfIn PDF document text
    • https://mafobosapufi.weebly.com/uploads/1/3/4/5/134505980/piloruwul.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://e924225a-aa46-4bfc-8e56-7341551e1833.filesusr.com/ugd/54dfea_7e1eb179d2c6403788ad628cec5f9474.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e47d4c63-9721-40a9-bf14-619426f4bd3b/wizz_air_call_centre_polska.pdfIn PDF document text
    • http://bisobowezite.rf.gd/tuxuxokikifeboj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f7295f1c-f760-442c-8dc4-a3a6671b0e35/hp_elitebook_2560p_specs.pdfIn PDF document text
    • https://59cf682b-6680-4a08-8b8d-0472bab64ef7.filesusr.com/ugd/d7d6cd_78cc622d416a48a380074b8878b22a8f.pdf?index=trueIn PDF document text
    • https://71a5d838-4e22-4830-8da1-7955ec3365f5.filesusr.com/ugd/f2f43e_14abb3fa17604e96bd0a953b879d335f.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d3d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3D7 5320 bytes
SHA-256: 4197b96cc1627a69996669a10f737e6fc91d2861c4a3aea3a36b939d0e6f8a8f
font_01_sfnt_off0000e5d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5D2 10444 bytes
SHA-256: 254bc2d488f8c67e08d2f0f0dfbd776d79fb6a96a4e86b899f36a6562cd30eba
font_02_sfnt_off00010995.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10995 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2