Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8e8aa8d41310772…

MALICIOUS

PDF

74.6 KB Created: 2021-05-16 16:00:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: a19e46e8608621656c799ac429acbba1 SHA-1: 10394c1ed50701258a2a5fa713e7128d16c044ba SHA-256: b8e8aa8d41310772b81d2ded994a28312ee2908b835a9739e67f9ab81b0a60f2
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 0.9999

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://jacksth.ru/strik?utm_term=how+to+make+a+paper+plane+fly+further PDF link annotation
    • https://ligotilup.weebly.com/uploads/1/3/4/3/134313371/8992119.pdfIn PDF document text
    • https://rofokaragi.weebly.com/uploads/1/3/2/8/132815015/dapanabegiwej.pdfIn PDF document text
    • https://rusaxexuratibu.weebly.com/uploads/1/3/2/6/132680860/runazodunis.pdfIn PDF document text
    • https://tizetenu.weebly.com/uploads/1/3/3/9/133999913/ruwonudubedona.pdfIn PDF document text
    • https://cdn.sqhk.co/rifelefiw/062jgeb/how_to_increase_credit_score_to_800_canada.pdfIn PDF document text
    • https://votokivefanatu.weebly.com/uploads/1/3/1/4/131453133/sesutarifapuvam-wunizijuko-vidiruvodusopug.pdfIn PDF document text
    • https://xidekudogigut.weebly.com/uploads/1/3/4/6/134683706/wesevawibize.pdfIn PDF document text
    • https://rebuxikaxaj.weebly.com/uploads/1/3/4/6/134668288/1863971.pdfIn PDF document text
    • https://cdn.sqhk.co/sadinuko/ggck3Gm/best_dragon_deck_yugioh_duel_links.pdfIn PDF document text
    • https://nugemezan.weebly.com/uploads/1/3/4/3/134359438/5c0d3.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/mojivikapeti/krups_ice_cream_maker_gvs1.pdfIn PDF document text
    • https://75edee45-cd08-43cb-a752-0c33e5c2343f.filesusr.com/ugd/a7c173_911361ef97d5410c9407e6a1eb28e0cd.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/juzinaramip/mikixejitam.pdfIn PDF document text
    • https://4b0cdf75-2e42-4830-99f1-bbdbaec3f661.filesusr.com/ugd/891219_7e2b466bd6fa4537bb70cdea9923078e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sojuravewi/python_string_format_get.pdfIn PDF document text
    • https://s3.amazonaws.com/povodijirig/guide_demande_d_autorisation_cptaq.pdfIn PDF document text
    • https://s3.amazonaws.com/juzewojavomofew/biblia_de_estudio_herencia_reformada_chile.pdfIn PDF document text
    • https://s3.amazonaws.com/degagaziv/bosch_microwave_repair_manual.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_off0000e5ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5EA 5184 bytes
SHA-256: e6c23dc9b60515383e141a62ffdd4682008d68ca087a56e12b6e4c86dd591502
font_01_sfnt_off0000f778.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF778 11416 bytes
SHA-256: f0e26194382fa1c2213f43b7ca5c414c872035050ced9f9d4ab33b00c75a51e6

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