Malicious PDF — malware analysis report

Static analysis result for SHA-256 97133bcefb3c37b3…

MALICIOUS

PDF

72.1 KB Created: 2021-03-21 02:05:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 29b766e2e01b0ff7482ff00bc68060dc SHA-1: 1f35a6eab5b3169883e1442719d228d525fa11d2 SHA-256: 97133bcefb3c37b31d27512e45aa0f0277e9d4c4858b31232e3e973db6d2c3a0
126 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs, with at least two pointing to suspicious domains that are likely part of a link farm designed to redirect users to malicious content. The document body, though heavily obfuscated, suggests a lure related to 'chess book for dummies pdf'. No scripts were extracted, but the presence of multiple external URIs and the link farm heuristic strongly suggest a phishing or content-luring attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://soxebez.ru/award?keyword=chess+book+for+dummies+pdf PDF link annotation
    • http://tovarajuxelogag.iblogger.org/cbc_manual_differential_interpretation.pdfIn PDF document text
    • http://girepodemaz.getenjoyment.net/cracking_toefl_ibt_2020.pdfIn PDF document text
    • http://wigigokewadusad.iblogger.org/66915411861.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450353/normal_604db7910f20c.pdfIn PDF document text
    • https://cdn.sqhk.co/fupupusamun/ZY3zjaj/tajemoxasovowifodanu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406229/normal_604ed6178c8e1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385421/normal_5ff1fa8a0a437.pdfIn PDF document text
    • https://cdn.sqhk.co/sedazozesufu/nKZWeU0/36918651864.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453117/normal_6055a751c39a6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lawedeg.rf.gd/cisco_3850_ios_upgrade.pdfIn PDF document text
    • http://vulopekusape.atwebpages.com/adobe_reader_for_android_tablet_free_download.pdfIn PDF document text
    • http://xuvekixofeku.onlinewebshop.net/why_does_songs_disappear_from_spotify.pdfIn PDF document text
    • http://ropupifalapoges.atwebpages.com/86673874026.pdfIn PDF document text
    • http://rikonobawo.epizy.com/wedijanajejut.pdfIn PDF document text
    • http://sajutab.rf.gd/bhartiya_samvidhan_in_marathi_book_free.pdfIn PDF document text
    • https://f0198b83-f3fe-41b4-8315-bacd7eabb238.filesusr.com/ugd/2b3f46_46ad5feb50094d87b50cb13f1581069e.pdf?index=trueIn PDF document text
    • https://d848e4b6-662b-4424-a759-963270729452.filesusr.com/ugd/30e015_6004f40b144d440a8340aa95d02ce6d7.pdf?index=trueIn PDF document text
    • http://nijarigu.onlinewebshop.net/36443338926.pdfIn PDF document text
    • https://1cdd1dcb-54a5-4750-95ad-c4cce9a68cd1.filesusr.com/ugd/1e32c2_e458174b6ebb46f08d92e5248eaf9a4b.pdf?index=trueIn PDF document text
    • https://1c54689f-8f60-44d8-8d81-b144d6ea8ada.filesusr.com/ugd/787b0a_ace9fb4f4c554bd9a59dea635b4aecc5.pdf?index=trueIn PDF document text
    • https://92fed17e-af34-466b-b3fe-38cd9ef27699.filesusr.com/ugd/192d58_e2ca53f7d5464ec89cf5957418f70c19.pdf?index=trueIn PDF document text
    • http://dikedelunok.rf.gd/pigefojisazasusof.pdfIn PDF document text
    • http://nozosikela.rf.gd/python_2.7_9_download_for_windows_7_64_bit_free.pdfIn 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_off0000e4f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4F6 5148 bytes
SHA-256: 4e59ddda2a50a28d8b5d73961f538b6c03a6cc980c79b63603dd95e4fb729de1
font_01_sfnt_off0000f648.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF648 11020 bytes
SHA-256: 1c0f40ee67e2a72e464f904d1107c8810ff9c9fceeecd9b756ecce1a9590db0e

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