Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f82a59ea2a1427b…

MALICIOUS

PDF

80.1 KB Created: 2021-04-05 01:16:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: a45ba0d651a5f531a10f98390d25458d SHA-1: e434b5d18f08667ffc3f6a2e34e058e506a4323d SHA-256: 5f82a59ea2a1427b686c1cb1ea6cfeee14c15670a6a75e81c94d540980e41a8e
186 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 0.9995

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://nipisod.ru/wix?keyword=chapter+4+accelerated+motion+worksheet+answers PDF link annotation
    • http://evatopshop.xyz/how_to_play_queen_on_piano_easyz7gzw.pdfIn PDF document text
    • http://muzibatixabu.mypressonline.com/the_anti_anxiety_diet.pdfIn PDF document text
    • https://cdn.sqhk.co/pajerelo/N9jiChb/top_corrugated_box_manufacturers_in_usa.pdfIn PDF document text
    • https://cdn.sqhk.co/fimegasaz/gZRSGzK/13286069884.pdfIn PDF document text
    • https://cdn.sqhk.co/bamebuxi/hijfKgd/victory_missionary_baptist_church_las_vegas_ustream.pdfIn PDF document text
    • http://tokio-2020.fun/wosomop93f81.pdfIn PDF document text
    • https://cdn.sqhk.co/xexisini/gciijdl/duolingo_learn_spanish_to_english.pdfIn PDF document text
    • https://cdn.sqhk.co/gigijuke/EYKjhaH/19733898329.pdfIn PDF document text
    • https://cdn.sqhk.co/vemoderama/gkAiigh/82529353556.pdfIn PDF document text
    • http://winoorama.fun/cassandra_clare_books_free2y5sw.pdfIn PDF document text
    • http://zifufarox.getenjoyment.net/christmas_carol_songbook_piano.pdfIn PDF document text
    • http://finoginujowiwi.mypressonline.com/bachianas_brasileiras_no._5.pdfIn PDF document text
    • http://formulamoney.top/pahatechi_bhakti_geete_marathi_free_downloadrnxla.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://d52aed46-be45-4f9b-8106-cf6fc7ee66c0.filesusr.com/ugd/b148e5_357eefc4f80b4ba9a3174df399fcec95.pdf?index=trueIn PDF document text
    • https://8f1ef4f7-3f23-41ef-a3d6-4e5873a175a2.filesusr.com/ugd/d318ce_eaafc0cb057f4de9980010f7bbf01c91.pdf?index=trueIn PDF document text
    • https://77da94c0-0f0a-445b-87af-e489a0b5ef66.filesusr.com/ugd/db1da1_3e6abfffb11f488d92c3d2b637f96f15.pdf?index=trueIn PDF document text
    • https://587b455d-cc79-4428-8e80-a8b75ce23bca.filesusr.com/ugd/021ec8_260277f4b49245d8bf96ed91ad5649f6.pdf?index=trueIn PDF document text
    • https://9d76d0c6-5807-43ac-a2ba-7b4112d1a20a.filesusr.com/ugd/5cd33b_43fac062ded04c5c8205c9b0c9f74c6e.pdf?index=trueIn PDF document text
    • https://d3826037-6016-486c-99e9-dc41bc666644.filesusr.com/ugd/b81754_a41ebc324c584e0cb2fc71023b2f28ca.pdf?index=trueIn PDF document text
    • http://lifobem.myartsonline.com/pujopoluvetexigoxo.pdfIn PDF document text
    • https://8bd0dbf5-62e0-4684-a95a-1d9666dfa34a.filesusr.com/ugd/e71694_ad04699870a7448eb1125b355dd8672a.pdf?index=trueIn PDF document text
    • https://24a70dd4-b549-4b9e-9c0a-6eea45ab85ad.filesusr.com/ugd/ab0c63_018b903ab4f24547a44db220c5e4147f.pdf?index=trueIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB1B 5368 bytes
SHA-256: 963e840d5c90a2601fab8caac6d480ae3b2a7ada4374bca7149eb1806a240752
font_01_sfnt_off0000fd50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD50 11344 bytes
SHA-256: 3e51f65a3b4a07a9d61f2d55c07d6218a0b2a0c41bfcac3c1ad7dcee06915c6d
font_02_sfnt_off00012460.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12460 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e