Malicious PDF — malware analysis report

Static analysis result for SHA-256 a617431af6489d95…

MALICIOUS

PDF

82.0 KB Created: 2021-03-26 15:12:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: b49b791c4e4abc080b790f200c8603e8 SHA-1: 3101b8e154cd15dadbbff8de3f21a25e6e5a1dc3 SHA-256: a617431af6489d95e5680062d8e66a3951209435751a92fa9c1767fbbbc68c30
156 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 0.9993

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://kuzutuzo.ru/strik?utm_term=streetcar+named+desire+themes+analysis PDF link annotation
    • https://cdn.sqhk.co/ligumorik/c0jhL4c/seruladawutibilataro.pdfIn PDF document text
    • http://timecodes.net/silverado_stepside_bed_dimensions77qvn.pdfIn PDF document text
    • https://fanuxerejupu.weebly.com/uploads/1/3/1/3/131398214/nelewozavow_robinasedaze_tuzarafu.pdfIn PDF document text
    • https://gabakunoza.weebly.com/uploads/1/3/4/6/134613042/9bd161ea.pdfIn PDF document text
    • https://laderorigeridag.weebly.com/uploads/1/3/4/3/134309938/6435985.pdfIn PDF document text
    • http://1s.london/68136806980p1ggk.pdfIn PDF document text
    • https://cdn.sqhk.co/zanudiwageg/ijWidic/50393267483.pdfIn PDF document text
    • https://kigotofu.weebly.com/uploads/1/3/5/3/135323523/vedibexovumu-mogober.pdfIn PDF document text
    • https://cdn.sqhk.co/fularulojoze/LgcZhdk/gorillas_in_the_mist_song.pdfIn PDF document text
    • https://cdn.sqhk.co/tufuboloruj/haZifG8/hacker_mode_among_us_pc_download.pdfIn PDF document text
    • https://xojinumawot.weebly.com/uploads/1/3/4/3/134377449/fizegutojugujogez.pdfIn PDF document text
    • https://cdn.sqhk.co/xuxofidipo/Sifiigi/airthings_corentium_home_radon_detector_review.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/lonozote/20151661619.pdfIn PDF document text
    • https://s3.amazonaws.com/zevutebulaworel/bluestacks_for_macbook_air.pdfIn PDF document text
    • https://s3.amazonaws.com/gonima/2014_chevy_cruze_diesel_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/seriposuj/merge_mac_automator.pdfIn PDF document text
    • https://s3.amazonaws.com/buponuwebi/6300158535.pdfIn PDF document text
    • https://559ef5b4-38f4-491c-95f5-a6f57f0534fb.filesusr.com/ugd/1b862a_770c09fc3db54cbba53b2e0c37c0c47a.pdf?index=trueIn PDF document text
    • https://a2c67b61-a01d-4053-b7ad-f1487bca8054.filesusr.com/ugd/24853a_e394feffd31745bcbd230bc6e389fef4.pdf?index=trueIn PDF document text
    • https://a0a5ada1-270c-452f-b092-d943fc6f0dc0.filesusr.com/ugd/306762_b472a2d4b94240cc9e0fe70608486da3.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fulosobezur/pearl_grandfather_clock_manual.pdfIn PDF document text
    • https://7e073981-ad1c-4081-8dc0-76946ba36063.filesusr.com/ugd/c4f63d_7d77496c1694498782b66dc78e0b8e4a.pdf?index=trueIn PDF document text
    • https://b73b9701-b1df-43be-b031-73419f87697c.filesusr.com/ugd/bfbd96_5c183f39aba24ea29cd4827a40ca84ba.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rexogeguxosix/suzumokopabipuratolewose.pdfIn PDF document text
    • https://s3.amazonaws.com/vovopafubipu/potential_barrier_and_tunneling.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_off000103e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103E5 5384 bytes
SHA-256: d9ced12e3f62bf4118e884adb0af118438b974efdb695fd847422daf1d99f713
font_01_sfnt_off0001160d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1160D 10872 bytes
SHA-256: 615fc661f0871d3413ec52aa88142179fe1015e86cbb6c06145037e9cb447b03

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