Malicious PDF — malware analysis report

Static analysis result for SHA-256 4db50e4de393df75…

MALICIOUS

PDF

82.9 KB Created: 2021-03-30 01:10:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: aa5ea5d6bee40877a8e0a0ec72e03ef2 SHA-1: 150a3b3a1a7e7c7dda47f591f881643e6b8fe522 SHA-256: 4db50e4de393df751cc3f218f4da8ba533add4d9d859c5800dd4f56c63e15fb2
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 0.9998

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/wix?keyword=otium+beats+user+manual PDF link annotation
    • http://centerverifybadge.com/vavuxumadebaxubaxebj2h0d.pdfIn PDF document text
    • https://cdn.sqhk.co/lamimegisu/nqshdxg/87628213991.pdfIn PDF document text
    • https://cdn.sqhk.co/dotusabu/edgfuLg/48528587909.pdfIn PDF document text
    • http://eurofamily.pro/59620629958vh29s.pdfIn PDF document text
    • https://cdn.sqhk.co/kejofuvata/TUaG2S4/black_labrador_retriever_christmas_cards.pdfIn PDF document text
    • http://towexiwi.sportsontheweb.net/rafuxuxarerozudipitavu.pdfIn PDF document text
    • https://cdn.sqhk.co/kopenanum/odwoUz9/22279693510.pdfIn PDF document text
    • https://cdn.sqhk.co/kinirebuseva/2gjsjbj/11064349706.pdfIn PDF document text
    • https://kelogukagikuval.weebly.com/uploads/1/3/0/7/130739039/7482006.pdfIn PDF document text
    • http://nekazupafo.mygamesonline.org/sawoxaluw.pdfIn PDF document text
    • http://ing-cliente.com/what_are_top_of_rack_switchesw8szf.pdfIn PDF document text
    • https://xaduregenotilok.weebly.com/uploads/1/3/4/7/134711203/f8f32ac77.pdfIn PDF document text
    • https://wigazivebale.weebly.com/uploads/1/3/2/6/132695242/rejedenodipabutopuxi.pdfIn PDF document text
    • http://logoped-samara.ru/what_is_the_storyline_of_hamletvlbnv.pdfIn PDF document text
    • https://cdn.sqhk.co/satasevubu/eDhaYlP/queen_greatest_hits_offline_full_album.pdfIn PDF document text
    • https://xafijedalab.weebly.com/uploads/1/3/0/7/130775792/1426066a4c755.pdfIn PDF document text
    • http://table-wait.com/non_destructive_testing_salary_in_south_africap5v00.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pozajuw.atwebpages.com/mathematical_statistics_john_e_freund.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_off00010763.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10763 5000 bytes
SHA-256: 62f5598dcc557b63a3824482fabe6742889e6da0e74cd590120dfbca6ae40fbd
font_01_sfnt_off00011841.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11841 11196 bytes
SHA-256: 23b979fd9908d0fc2fafbc6ba9012ce34f6d2618326ee9e0ae0d8b1de76de02d

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