Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1138bb8698ca098…

MALICIOUS

PDF

76.2 KB Created: 2021-02-23 21:52:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 02f77bd5df0949d64a8ca0f585836e6e SHA-1: 65d5a33632596919cb8af4ba446a1e77cfdf968c SHA-256: b1138bb8698ca098495cfd341782bdb8efcdd80492b17c321aeb77cada25898b
126 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains embedded URLs, with one prominent URL pointing to 'seumenha.ru' which is likely part of a phishing lure related to the document's content. The PDF also exhibits characteristics of a link farm on disposable hosting, suggesting a campaign to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://seumenha.ru/wb?keyword=my%20refrigerator%20is%20not%20cold%20but%20the%20freezer%20is%20working%20fine PDF link annotation
    • http://clyb-wylcan3.space/bedotutovopatabilkrp7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384150/normal_6018d0e4a4a53.pdfIn PDF document text
    • http://sportplays.ru/55645040373yt6an.pdfIn PDF document text
    • http://metalllift.ru/5_inch_binder_spine_template_microsoft_word670bm.pdfIn PDF document text
    • http://contentmedialiteracy.com/14280240247bm2.pdfIn PDF document text
    • http://trendmobile.ru/golden_psp_emulator_pro_apkogpnb.pdfIn PDF document text
    • http://republvinb.fun/how_much_oil_does_an_onan_5500_generator_takes0be0.pdfIn PDF document text
    • http://letnesil.xyz/evaluation_cm1_adjectif_qualificatif4ldk1.pdfIn PDF document text
    • http://trikotoria.ru/how_to_connect_logitech_wireless_gamepad_f71009xj5.pdfIn PDF document text
    • http://lnstagramverifiedsbadgeforms.com/3ds_max_tutorial_booksrxro1.pdfIn PDF document text
    • http://purpless.vip/sindh_rented_premises_ordinance_1979cf3at.pdfIn PDF document text
    • http://meblik.su/verizon_jetpack_manual_6620l3xjn7.pdfIn PDF document text
    • http://teenagetutor.online/89319171581baxpd.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/dazutun/write_decimal_numbers_in_words_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/mizeteb/93041010516.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_off0000eb9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB9E 5736 bytes
SHA-256: 6dc688cdcdf67695e45151c17b3891d4190d9bf569476d5daa3dcaf40ab0542a
font_01_sfnt_off0000ff50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF50 10504 bytes
SHA-256: 1d86411d7aa8490f7a3fc61ef8268b165b4c339aec33b947064f4fb2130d70a8

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