Malicious PDF — malware analysis report

Static analysis result for SHA-256 1681b690bf0a7588…

MALICIOUS

PDF

80.9 KB Created: 2021-03-23 03:01:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: d119070fe803bbac1b03acc543dd4021 SHA-1: 57346fe1c162e9c2afdff856247ed63943df59ab SHA-256: 1681b690bf0a7588edf3abef93f12ab2c25c2302067efb64599adf588c82289f
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-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://leonvi.ru/wix?keyword=systematic+observation+definition+psychology PDF link annotation
    • http://private-channel.site/naruto_senki_full_characterwir52.pdfIn PDF document text
    • https://ravaratu.weebly.com/uploads/1/3/5/4/135401011/xubojavafepo.pdfIn PDF document text
    • http://odebayitrafikhizmeti.com/xakifexiwikurirdepdp.pdfIn PDF document text
    • https://cdn.sqhk.co/pitadewedobu/iaaijwv/27751006448.pdfIn PDF document text
    • http://6gusevshop.space/hedwig_s_theme_classical_guitar_sheet_musics7e7s.pdfIn PDF document text
    • https://fobafomenizu.weebly.com/uploads/1/3/4/7/134753661/rexufoja_runori.pdfIn PDF document text
    • https://muzikalojex.weebly.com/uploads/1/3/4/0/134012647/9529654.pdfIn PDF document text
    • https://cdn.sqhk.co/wibezudak/ibPDjgU/autotrader_used_cars_under_5000.pdfIn PDF document text
    • http://sadovik.me/math_division_worksheets_without_remaindersjq5qe.pdfIn PDF document text
    • http://aycotoro6.xyz/audi_s4_b5_avant_coiloversbm2ik.pdfIn PDF document text
    • http://vodoroding.info/what_did_leta_lestrange_do_to_grindelwaldyxsvm.pdfIn PDF document text
    • http://semengergel.ru/liftmaster_8355_or_8550kqiaz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://a519209a-2b0a-481f-9fe9-460c873bdc80.filesusr.com/ugd/270e53_d7bb7efe68f6429fac9efd8a901c00e8.pdf?index=trueIn PDF document text
    • https://9e1e9198-0fe7-4103-8084-fdcc6befb8d5.filesusr.com/ugd/2f7815_2c83cc6f45b946a3997b27399cfd53b2.pdf?index=trueIn PDF document text
    • https://709e7e89-b264-4d73-b757-064736ed86f1.filesusr.com/ugd/f523c3_2e1305fe0c1a4745a9ac083c242fe11c.pdf?index=trueIn PDF document text
    • https://a97cc435-ef8e-4ffb-8544-4b9c0bda5a6e.filesusr.com/ugd/7ab440_a73fdd597b9c4b498497e6ccadd936b4.pdf?index=trueIn PDF document text
    • https://1c54689f-8f60-44d8-8d81-b144d6ea8ada.filesusr.com/ugd/787b0a_37ea0ca2b8f8427b946cc7896702df7e.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_off0000fd43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD43 5976 bytes
SHA-256: 985f22007bac2cb080d51922d5c517dcf6d247bc8429f24ae5875e430b39d16a
font_01_sfnt_off00011178.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11178 10848 bytes
SHA-256: f57fc126a15760477473f619467d699506b2e06c02635b6fd1211df528a8de8d

Open this report in the interactive analyzer, or submit your own file for analysis.