Malicious PDF — malware analysis report

Static analysis result for SHA-256 b040c970f1fd730e…

MALICIOUS

PDF

73.4 KB Created: 2021-02-07 09:05:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 1982a60cba1ae44ba036193e23daadd5 SHA-1: dac7e05285ae4a339c4735bc7b86ae9858d66c57 SHA-256: b040c970f1fd730ec1b5ef5d2abda9bb418a0d2e5cd38005bf3320c6f5eb5dfd
96 Risk Score

Malware Insights

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

The file is a PDF document identified as malicious by ML classifiers and ClamAV. It contains an embedded URI pointing to a suspicious domain, which is likely part of a phishing or scam campaign. The document body, though partially garbled, suggests a lure related to 'Conectores de introducci c3 b3net'. No scripts were extracted, but the presence of external URIs and the overall detection indicate an attempt to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://druttle.ru/123?utm_term=conectores+de+introducci+c3+b3net PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4417656/normal_601ddb6cddde1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453764/normal_5fe9de2620869.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420230/normal_5fe3be7dc5107.pdfIn PDF document text
    • http://arfesopt.com/graphic_design_rate_sheetwko1n.pdfIn PDF document text
    • https://cdn.sqhk.co/wadusazilox/shjchhb/susov.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367635/normal_6009da73f2dbc.pdfIn PDF document text
    • https://cdn.sqhk.co/nigezufi/BhjIn8x/nototisaxan.pdfIn PDF document text
    • https://cdn.sqhk.co/gupidiroka/agdyxie/piano_master_2020_apk_download.pdfIn PDF document text
    • https://cdn.sqhk.co/xetilibul/hjehj9f/32721684990.pdfIn PDF document text
    • https://cdn.sqhk.co/garisuvonuk/gAhciFJ/88811362414.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/zatazewoz/fixobobonajusobonijederol.pdfIn PDF document text
    • https://s3.amazonaws.com/pevarijidasalop/learn_korean_language_app_free.pdfIn PDF document text
    • https://s3.amazonaws.com/lososimap/heart_broken_rap_songs.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_off0000e555.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE555 4900 bytes
SHA-256: 337853d730d88c8d5de4f83c470dfe23ffb8f87b2965f4b5162c25a888bcf90d
font_01_sfnt_off0000f604.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF604 10156 bytes
SHA-256: 68ec4ff112f03064b93b5079e01f4db5ed28b4494c703034cbee144a30dcb09e