Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4820728b31e3ca1…

MALICIOUS

PDF

87.3 KB Created: 2021-06-09 00:41:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: ef7ab875e6a81ce63928ac174422c7cd SHA-1: df456e3a394278369976f87212edd2f755757c0a SHA-256: c4820728b31e3ca1f21bc20816c8a4a04501241e4ff95f6adb6515150eacf0b6
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 high likelihood of malicious intent. The PDF contains numerous embedded URLs, with one prominent URL pointing to 'irlanc.ru', suggesting a phishing or malware distribution attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this by identifying the PDF as a link farm on disposable hosting, likely designed to obscure the true malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://irlanc.ru/pbw?utm_term=apk+raft+survival PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4452206/normal_5fdbfa5c02200.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405206/normal_6044fcf66ace1.pdfIn PDF document text
    • https://ribovaboj.weebly.com/uploads/1/3/0/7/130775049/garekudofo.pdfIn PDF document text
    • https://pozufijuxib.weebly.com/uploads/1/3/0/7/130775557/8023272.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389570/normal_604b9374ce58c.pdfIn PDF document text
    • https://dakewamegiru.weebly.com/uploads/1/3/5/3/135305658/kawesonadeda.pdfIn PDF document text
    • https://kemusawef.weebly.com/uploads/1/3/4/7/134770671/fopusujala-mixojevipumitu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489050/normal_6012c95d7b7ff.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://davusavesasi.pbworks.com/f/jizuwazib.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a7033010-56a9-40c1-9cbd-ad650ab69df2/36386109309.pdfIn PDF document text
    • http://mikabipi.pbworks.com/f/vopipudukegunuzu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6a4bf758-2985-4d17-ad5a-0a7b5485abb5/83591138181.pdfIn PDF document text
    • http://gomedaj.pbworks.com/f/fufigijosakofexizubasa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d6967f9c-264c-473d-b3d9-81f67048e98c/roland_juno-ds61_synthesizer_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fd894bce-38ed-4205-ab1e-01d922011cad/kipadoki.pdfIn PDF document text
    • http://tuvovazuvezo.pbworks.com/w/file/fetch/144631044/gta_5_best_vip_work_solo.pdfIn PDF document text
    • http://mizunebapod.pbworks.com/f/new_headway_advanced_teachers_book_fourth_edition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5dcc8e51-14ae-4237-8632-a15ac9e6b97a/rewizawemuwudegaveva.pdfIn PDF document text
    • http://faxofapuf.pbworks.com/w/file/fetch/144780279/94800704219.pdfIn PDF document text
    • http://vakerul.pbworks.com/w/file/fetch/144870384/what_is_the_dramatic_irony_of_the_poppet_in_the_crucible.pdfIn PDF document text
    • http://wepoline.pbworks.com/f/53055881241.pdfIn PDF document text
    • http://palixazoke.pbworks.com/f/tatiana_manaois_like_you_video_mp4.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_off0000e590.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE590 5008 bytes
SHA-256: b026294cba980246d07cad2b2876ab27e371eabd820cd882e9501ea1c32f686c
font_01_sfnt_off0000f6ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6AD 5020 bytes
SHA-256: b438184068aba9c534491fb019319a0d305cfa41214cc23a38730905f3871e7a
font_02_sfnt_off000109ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109EE 19900 bytes
SHA-256: ca934012e4f7e9ab23fec1cadc95c0031c9ff9fab5a6eb0de14e1bd16cc0a9c5
font_03_sfnt_off000138b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138B1 16136 bytes
SHA-256: 4c5c53ea4d042901e3a1263d5b714d52851b908b680329d5fa194b1bbff3b7f6