Malicious PDF — malware analysis report

Static analysis result for SHA-256 a497cfa1ac1bd231…

MALICIOUS

PDF

86.4 KB Created: 2021-03-31 08:18:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 4676597e5b6d3c7d954cce67fbf98044 SHA-1: 6e0b9e06f5732f4d2c23ef97318805e18e70b9b9 SHA-256: a497cfa1ac1bd231c703ddadb0fc3a2ae8a33eda8b8c9cdb16769568f1e8364a
194 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicative of a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or SEO abuse. While no scripts were explicitly extracted, the PDF structure and embedded URIs point towards techniques used to distribute malicious content or manipulate search engine results.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://kuzutuzo.ru/strik?utm_term=green+smoothie+for+life+jj+smith+reviews PDF link annotation
    • https://cdn.sqhk.co/towevefizub/jxdhbid/tavilobedosizerewuk.pdfIn PDF document text
    • https://kaperimivegorew.weebly.com/uploads/1/3/4/3/134371305/6269325.pdfIn PDF document text
    • https://buserakufazuwus.weebly.com/uploads/1/3/4/0/134097478/mabijesetoxesukab.pdfIn PDF document text
    • https://linazoforup.weebly.com/uploads/1/3/0/8/130814758/e21e2.pdfIn PDF document text
    • https://nefolebar.weebly.com/uploads/1/3/4/4/134400051/fedepufaso_xevaxo_poxuroduluveki.pdfIn PDF document text
    • https://luvodufugatese.weebly.com/uploads/1/3/4/8/134893210/vosedip.pdfIn PDF document text
    • https://sovajavab.weebly.com/uploads/1/3/4/0/134041947/pubew.pdfIn PDF document text
    • https://tonukujile.weebly.com/uploads/1/3/1/8/131857071/3367871.pdfIn PDF document text
    • https://jarofipe.weebly.com/uploads/1/3/1/4/131408229/tifitav.pdfIn PDF document text
    • https://lizatupapej.weebly.com/uploads/1/3/4/4/134401074/3b4231.pdfIn PDF document text
    • https://cdn.sqhk.co/soxaxojuxa/bMjbqjj/95007043218.pdfIn PDF document text
    • https://mirajaxudedina.weebly.com/uploads/1/3/0/7/130775596/varisenarowigoju.pdfIn PDF document text
    • https://lizelizana.weebly.com/uploads/1/3/1/4/131409616/5288946.pdfIn PDF document text
    • https://wudunuxez.weebly.com/uploads/1/3/1/4/131453857/263ce8cab0d.pdfIn PDF document text
    • https://tivepikilusu.weebly.com/uploads/1/3/4/7/134759048/pipisu_babib.pdfIn PDF document text
    • https://cdn.sqhk.co/gusisitixinu/hNcAzhd/45303690350.pdfIn PDF document text
    • https://sefositudixe.weebly.com/uploads/1/3/4/5/134524400/sikuvotiturenem-jutosiwi-rotexokumel-mureketapi.pdfIn PDF document text
    • https://cdn.sqhk.co/vumuwuxa/yjghkjd/fox_sports_deportes_en_vivo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/ac5773d6-9f39-4471-b574-8467c7d2f264/how_to_use_my_dash_egg_cooker.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8cdb7ea0-bc57-4091-9f3c-619cfda58428/82245267833.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/69a741f1-64e1-4195-b6c4-96350567f8b4/epson_tm-t88v_model_m244a_driver_windows_10.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ac093d14-3a86-4702-b502-323988221921/xufexijesuvumu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ec33b129-48fc-49d9-90e0-04d4f092e438/34017663352.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2b1cffe5-03bc-4489-ae9d-1b1db91476f6/fipidiseperi.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fb7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB7A 5056 bytes
SHA-256: 6726f65a197f93cb841cc8c4b6d015cabd0a19d0c6269c3236c71f8dcc9bb427
font_01_sfnt_off00010ca0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CA0 11648 bytes
SHA-256: bd422ac7a93177d86866bfde0fcf464a8a806d8b5ea9f9303dec978a90a7114e
font_02_sfnt_off000134c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134C7 16132 bytes
SHA-256: 4f6d6443d667672870c38ce4e1d364e29e61a0df6fd2d8217a47270b9fff04c9