Malicious PDF — malware analysis report

Static analysis result for SHA-256 5df22702fd386a7d…

MALICIOUS

PDF

69.1 KB Created: 2021-04-06 09:26:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 2d56fdb2f164a22f8695d48ce4d23fa3 SHA-1: 84d0ba4673399d1680869a531dec045babf0ed59 SHA-256: 5df22702fd386a7d739237ba8084ba84006d409053bd858fed09f2f9b1fa3d57
166 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. It uses a password-protected-archive lure. 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 0.9997

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://nipisod.ru/wix?keyword=union+county+sheriff+nc+accident+reports PDF link annotation
    • http://esclub.info/68690177654ifb02.pdfIn PDF document text
    • http://dulugidi.iblogger.org/vetavifuxonirazuronenar.pdfIn PDF document text
    • http://hangookoil.ru/renisexatujidow42py.pdfIn PDF document text
    • http://negimemexib.iblogger.org/45415959672.pdfIn PDF document text
    • http://orbitan.fun/538903321042lz93.pdfIn PDF document text
    • http://tramlaweq.online/38498522647t00v4.pdfIn PDF document text
    • http://lestyprin.online/47266912794oshdc.pdfIn PDF document text
    • http://dalkomis.website/how_to_grow_red_leaf_lettuce_from_seed4jkry.pdfIn PDF document text
    • http://instapodarok365.site/casio_fx_115es_plus_only_shows_fractionsuzvqf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jutivowewinuled.epizy.com/la_valse_d_amelie_piano_sheet_music.pdfIn PDF document text
    • http://zenadeguposu.rf.gd/ganuvejorunijapef.pdfIn PDF document text
    • https://1c54689f-8f60-44d8-8d81-b144d6ea8ada.filesusr.com/ugd/787b0a_f8d983346a38448895f1881ebf2b35f3.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/mejados/playfair_script_font.pdfIn PDF document text
    • https://s3.amazonaws.com/sojebelevenex/mapudipazumifopusofodu.pdfIn PDF document text
    • http://tamakibegotilo.epizy.com/booking_application_letter_format.pdfIn PDF document text
    • http://fukevitadej.epizy.com/swann_dvr_81575_password_reset.pdfIn PDF document text
    • http://nekobegediru.epizy.com/31895275561.pdfIn PDF document text
    • https://b7c6a474-53ed-4139-af63-4b2f501ae0e7.filesusr.com/ugd/e87294_b379325546e94d198b766cb1bb108937.pdf?index=trueIn PDF document text
    • http://xokofenox.epizy.com/xavesam.pdfIn PDF document text
    • http://gokozir.rf.gd/98961852444.pdfIn PDF document text
    • https://5f384421-c3d0-4b4c-85a6-d3745974446f.filesusr.com/ugd/40006b_2dc041dbf9004b02834af07377be9592.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_off0000cebc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEBC 5304 bytes
SHA-256: a644771995fcec512e8fc325f0f58ed8fcc87b9ef803bdca52f4de954c211d1a
font_01_sfnt_off0000e0cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0CC 10888 bytes
SHA-256: 205b03deffa542fab24e6e2598e928351e9bb35f5a4f35b80a600b566c53f8e3

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