Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3855031a16e4791…

MALICIOUS

PDF

87.6 KB Created: 2021-03-31 11:37:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 62e3360188b6dbded18f317a4257b15d SHA-1: 771627ac5ecdf23c5f0f2d13d94145d47585bc13 SHA-256: d3855031a16e47911072325bf7b24e8e1a800a8211839b8a9fd01ce661cae1a7
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 0.9997

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://jumiwimov.ru/award?keyword=diy+playhouse+plans+pdf PDF link annotation
    • http://wigobike.sportsontheweb.net/accounting_words_dictionary_english_gujarati.pdfIn PDF document text
    • http://woxijakuzadajew.getenjoyment.net/pdf_split_and_merge_download_portable.pdfIn PDF document text
    • https://limotesatax.weebly.com/uploads/1/3/1/8/131871768/eccbc75c.pdfIn PDF document text
    • http://bugosegu.scienceontheweb.net/bodar.pdfIn PDF document text
    • http://mozujana.22web.org/aiag_spc_manual_download.pdfIn PDF document text
    • https://bakadowo.weebly.com/uploads/1/3/1/3/131380427/0471e7466fae9.pdfIn PDF document text
    • http://greatholl.com/s3_bucket_terraform_module6evin.pdfIn PDF document text
    • https://kujegafibez.weebly.com/uploads/1/3/4/2/134265926/7438406.pdfIn PDF document text
    • http://smartradiobf.ru/dti_business_name_registration_form63904.pdfIn PDF document text
    • http://ziragekezazu.iblogger.org/fomugejipuko.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
    • http://bulojidaxuxuvod.rf.gd/88238438280.pdfIn PDF document text
    • http://zaninoj.epizy.com/logebegegurobobet.pdfIn PDF document text
    • http://bopasewawimugu.epizy.com/quantitative_ethnography.pdfIn PDF document text
    • https://54d25d35-1219-4e5f-97c3-905e72ea606f.filesusr.com/ugd/6d59ab_69a3d09f619b46eeb5c8523123fe8fa0.pdf?index=trueIn PDF document text
    • http://lofoxos.epizy.com/ganigisutakubu.pdfIn PDF document text
    • https://5c2df1de-05ea-4e17-9aa3-38adc7ce3153.filesusr.com/ugd/ddd609_7c72c398065c441cb7026d718cce3993.pdf?index=trueIn PDF document text
    • https://e0271a52-a7af-48e9-8a99-924ce320ec62.filesusr.com/ugd/be5703_2003f9f9a3a6415caa81625b42469038.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_off00010d39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D39 4936 bytes
SHA-256: 4da2bf66c4a6362e8783f9f700a51dadf7b0d859d0e5b4face2fcf7c6db408d8
font_01_sfnt_off00011dfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DFB 10984 bytes
SHA-256: 02e640ad5bc2b98ad019430934a53ea21e8e54b00a703b83bb79fc6d42378857
font_02_sfnt_off00014375.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14375 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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