Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0424e67ad80335d…

MALICIOUS

PDF

74.1 KB Created: 2021-03-13 15:29:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: a0a47f84157a5ec58d87593f3436b40c SHA-1: 843e02a4b8b2d100e01dfe8ae5133ca50ecd269d SHA-256: b0424e67ad80335d2f98a24b79abf5ec8c3a9888823ecc78ff0fd4788f77addf
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 0.9993

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://mezovuduw.ru/strik?utm_term=how+much+oil+does+a+honda+fourtrax+350+take PDF link annotation
    • http://avit0.pro/zuliluxinuo93ae.pdfIn PDF document text
    • https://xonaxogurevof.weebly.com/uploads/1/3/1/4/131453171/b3f8a4ff27168d5.pdfIn PDF document text
    • http://alkim.xyz/planos_de_instalaciones_sanitarias_p0baua.pdfIn PDF document text
    • http://future-techno.ru/jejiguribubojusapiwyne8j.pdfIn PDF document text
    • http://collegegraduatecentraldating.com/sonic_hacking_contest_2017n5n2s.pdfIn PDF document text
    • http://goods-amzon.com/vurudusefufovefoz53qrl.pdfIn PDF document text
    • http://naturebiolog.fun/jiforafigegewogonegijumeykirg.pdfIn PDF document text
    • http://casserlabs.xyz/least_common_denominator_worksheet_with_answer_keynsi3i.pdfIn PDF document text
    • http://fitokapss.xyz/ascertaining_the_three_vowsnwcng.pdfIn PDF document text
    • https://menajogatidufe.weebly.com/uploads/1/3/0/7/130740573/boriku.pdfIn PDF document text
    • http://nurigoluda.mygamesonline.org/adobe_scanner_android.pdfIn PDF document text
    • http://groshyk.site/mitsubishi_mr_slim_troubleshooting_not_coolingjcoi9.pdfIn PDF document text
    • https://pasugewu.weebly.com/uploads/1/3/1/0/131071180/dagafetajajujud-teluletugax-luwukevuluwaro.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://6cf80756-66c2-4d2e-b15d-ff1677cb7115.filesusr.com/ugd/2257e8_25d4493fc6c145508deb866b37f0cc2b.pdf?index=trueIn PDF document text
    • https://551f0ad2-75d1-4009-b90b-2f3e3e20230b.filesusr.com/ugd/c2bf0a_198cc9d910ec47b6af0370bda0c76ec9.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sorapobuk/pojuzixofexe.pdfIn PDF document text
    • https://s3.amazonaws.com/likadojivivofu/zupesexo.pdfIn PDF document text
    • https://fe92b815-f0fe-4223-924b-659339f44b90.filesusr.com/ugd/8f64fc_efe8e91a93b64bd2a6c4cb0f30aa80d4.pdf?index=trueIn PDF document text
    • http://sazasewugekupej.onlinewebshop.net/beyond_the_walls_2012_full_movie.pdfIn PDF document text
    • https://s3.amazonaws.com/titugome/buvarawejebugagutonewemof.pdfIn PDF document text
    • https://c6f55193-7475-4343-97dd-33cb3b141b6a.filesusr.com/ugd/808d8c_a2d98228c39a47a8b23ad33a2574d937.pdf?index=trueIn PDF document text
    • http://zujisofivo.onlinewebshop.net/hornady_150_gr_300_blackout_load_data.pdfIn PDF document text
    • https://ab25a8b3-4d80-4d4b-93a1-c1347014fa7c.filesusr.com/ugd/8d0191_0dc3d46270d742f694599b40c2c21c37.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e011.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE011 5876 bytes
SHA-256: 29a89a3b31369a28a6f2fe55cb4a239d8efa8df2ca50bbd1087d077324b72afb
font_01_sfnt_off0000f3f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3F9 11644 bytes
SHA-256: c9bbc90988ba715824124224567f4695d04558b5821a975ecc1d0143d213c9d4