Malicious PDF — malware analysis report

Static analysis result for SHA-256 dab76e302de77824…

MALICIOUS

PDF

89.0 KB Created: 2021-06-06 14:38:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 50eff29a1b4fef75f85ab2304c7045d2 SHA-1: db6472f9f2d60fef2ebddddae7acb19b0fa105c1 SHA-256: dab76e302de77824220d5fb2184d7d0039c542597cda4fddab74e6c203039594
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one prominent URL pointing to a suspicious domain ('crewmak.ru') that is flagged as malicious. Heuristics indicate the PDF acts as a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly support a malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://crewmak.ru/pbw?utm_term=papita+mani+toston+2+descargar+mega PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4448332/normal_6039d5f3a8590.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412896/normal_6008943412e59.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426960/normal_5fed26e8a95b8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418746/normal_5fc6da1ff09d7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4494147/normal_5fe2554a9c7ea.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wuxikadafi.pbworks.com/w/file/fetch/144638787/7716296549.pdfIn PDF document text
    • http://tisowowuduwe.pbworks.com/w/file/fetch/144425838/minedijezunixepesafo.pdfIn PDF document text
    • http://padimagofo.pbworks.com/f/56005744238.pdfIn PDF document text
    • http://jebodigezev.pbworks.com/w/file/fetch/144524874/how_to_run_proform_treadmill_without_ifit.pdfIn PDF document text
    • http://zuvevetub.pbworks.com/f/cinema_apk_ad_free_1._5_download.pdfIn PDF document text
    • http://gegoxelaw.pbworks.com/f/7__4.pdfIn PDF document text
    • http://wurutaw.pbworks.com/w/file/fetch/144713031/jujoxu.pdfIn PDF document text
    • http://sorawako.pbworks.com/w/file/fetch/144445662/goluvafesogowivitimup.pdfIn PDF document text
    • http://mibegenav.pbworks.com/f/avast_antivirus_premium_apk_free_download.pdfIn PDF document text
    • http://memofemovo.pbworks.com/w/file/fetch/144618642/what_intermolecular_forces_does_nitrogen_tribromide_have.pdfIn PDF document text
    • http://jifesepapo.pbworks.com/f/popopenukajetowej.pdfIn PDF document text
    • http://muxopal.pbworks.com/w/file/fetch/144440484/epson_l3110_resetter_full_keygen_adjustment_program_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b7d20f4e-c62d-448b-8dee-76c03549504c/cultural_anthropology_asking_questions_about_humanity.pdfIn PDF document text
    • http://pezeliv.pbworks.com/f/wagunibi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/59b14f06-9b50-4a47-afd9-5bb99f4ac6b1/masuvuw.pdfIn PDF document text
    • http://katafuzum.pbworks.com/f/how_to_fill_out_a_stock_ledger.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off00013d4b.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x13D4B 16544 bytes
SHA-256: e4c5dad20de182aad220be432b18e636cedef47006e1dcad79807deb07dcadf7
font_00_sfnt_off0000e251.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE251 5828 bytes
SHA-256: bb8b493dabe1c6913625c997c9213cb0f74db77b4223b6d02d41124fd50a8870
font_01_sfnt_off0000f62a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF62A 5492 bytes
SHA-256: 05730fa9be12db9c42c8312d843fc9e04e82317f02127e2742c12a1e3135ea38
font_02_sfnt_off000108be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108BE 3596 bytes
SHA-256: 42b367e811992253635e33ee02a46d322c246111ff7df10daa30b47c239aa923
font_03_sfnt_off000116a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116A8 11908 bytes
SHA-256: ed4ec8d0e6c71aa7d8c185609218b0fbe268057cc89ffaa9630ad4921dc089f8