Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b3dcfa6364d5272…

MALICIOUS

PDF

86.5 KB Created: 2021-06-04 09:23:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 814fe17880222e970f91bcfcfbde9f37 SHA-1: 4845816444847a957d762e06e392c56baebb4d92 SHA-256: 5b3dcfa6364d52725ce62e12675533be7915e84c08aa59917b9971fa07363f74
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm designed to redirect users to potentially harmful sites. The embedded URLs and the document's structure suggest it is used as a lure, possibly for phishing or to distribute further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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
  • 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.
  • 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://nomylo.ru/pbw?utm_term=beyblade+burst+evolution+episode+37+english+sub PDF link annotation
    • https://rojobasexadef.weebly.com/uploads/1/3/2/7/132711954/9470672.pdfIn PDF document text
    • https://mabexerezigija.weebly.com/uploads/1/3/5/3/135324341/7863750094.pdfIn PDF document text
    • https://woxumonukoke.weebly.com/uploads/1/3/6/0/136090180/degizemasabam.pdfIn PDF document text
    • https://nagenexam.weebly.com/uploads/1/3/0/7/130776307/1565692.pdfIn PDF document text
    • https://rizizisexulap.weebly.com/uploads/1/3/1/4/131407181/2171796.pdfIn PDF document text
    • https://guvijubeb.weebly.com/uploads/1/3/5/3/135318684/totosetejelun.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/2d4e7a08-90b3-468b-9a52-f23a8e7d962b/what_literary_devices_are_used_in_fahrenheit_451.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/55b03a62-b547-463b-ad17-bee542862381/26265933993.pdfIn PDF document text
    • http://litorabi.pbworks.com/f/progetto_genoma_umano_zanichelli.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0eba804d-dc2d-4fe3-9658-9d9e9a4c00bc/what_exercise_can_you_do_in_place_of_pull_ups.pdfIn PDF document text
    • http://mujefapufefi.pbworks.com/f/elite_temporada_5_danna_paola.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0a428b35-4dd9-4d16-b5f7-e3906b01ca18/adding_fractions_with_like_denominators_worksheets_with_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/850b3a6e-233b-474f-a6a3-24ebcf5086c2/54486400479.pdfIn PDF document text
    • http://rupebaxo.pbworks.com/w/file/fetch/144599409/29526980726.pdfIn PDF document text
    • http://gazumadu.pbworks.com/f/55467064224.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5a8de930-ee8d-473e-9534-0ab44291b068/28296591146.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b3c7e144-d27c-47c3-a9ab-902d6b1a2c9f/does_goat_simulator_have_online_multiplayer_ps4.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ddf64951-609e-4ac5-b2a0-048e785c89e5/what_are_3_examples_of_homologous_structures.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2f5dc9d5-32c7-4486-8607-e139bb96f396/komavezamelikoniwufepigi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc6b8a7c-0bb7-47e0-ab32-45a71bf066a3/98181500351.pdfIn PDF document text
    • http://funuvutidip.pbworks.com/w/file/fetch/144461640/64391062310.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA6B 4472 bytes
SHA-256: c8e940f728a2411a07a690095086d4d3eba353600200984e70778871ca243c61
font_01_sfnt_off0000fa0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA0D 5816 bytes
SHA-256: cf487d970ca325b4cfa0f1e29ce952b74058482f9c962cfb51f3dea43bf2a32c
font_02_sfnt_off00010de3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DE3 11516 bytes
SHA-256: 2ea440e607d1dec2dc402378f86ae6ffdef7227a28ca3a21dd3b093fd0a66272
font_03_sfnt_off00013416.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13416 16132 bytes
SHA-256: 6c511cd2548aab1566dad8f54fccf2be4cd056cf5a4d5d56937977fde9165995

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