Malicious PDF — malware analysis report

Static analysis result for SHA-256 77b45061662f01c6…

MALICIOUS

PDF

74.3 KB Created: 2021-03-15 07:34:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: eee3e951237234c7093665642c5e43c9 SHA-1: 5885e5e9fbaab17d640c012b5f1a80f0e902102f SHA-256: 77b45061662f01c649694d1c2b26e621c74fcb62ad0b360236f63930eaa964cc
126 Risk Score

Malware Insights

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

The PDF file contains heuristics indicating it is a link farm and has been flagged as malicious by ML classifiers and ClamAV. The document body, though heavily obfuscated, contains text suggesting a lure related to 'baby dance video 3gp'. The primary IOC is the URL https://resalured.ru/123?utm_term=baby+dance+video++3gp, which is likely used to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 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://resalured.ru/123?utm_term=baby+dance+video++3gp PDF link annotation
    • https://cdn.sqhk.co/gobumavurob/A5KheNm/canon_print_inkjet_selphy_for_macbook_air.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485001/normal_5fda8e85d5653.pdfIn PDF document text
    • http://zoomita.space/lularexajulojutepavz5tc1.pdfIn PDF document text
    • https://cdn.sqhk.co/puvegipuros/fjcic8J/new_york_city_sightseeing_guide_license.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489257/normal_5fe695badf833.pdfIn PDF document text
    • http://magnetfix.store/how_to_paint_alla_prima_still_lifegfco6.pdfIn PDF document text
    • http://copyright-notice-ig.com/what_are_the_613_laws_of_torah1253b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489245/normal_60183d5d94443.pdfIn PDF document text
    • http://peskomment.ru/niwojurumuwukevylufi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471692/normal_5ffdead06196b.pdfIn PDF document text
    • http://ighelpcenter.xyz/82887165949ylawa.pdfIn PDF document text
    • https://cdn.sqhk.co/kunimoxifagi/jhjcjfD/40848155134.pdfIn PDF document text
    • http://spain50off.info/wokoziguvanibesoxapugaw56x.pdfIn PDF document text
    • http://labincom-med.ru/defined_design_templatef3v9k.pdfIn PDF document text
    • https://cdn.sqhk.co/vekunego/hjAjfhg/maxpreps_baseball_california.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445729/normal_5fdecfee91732.pdfIn PDF document text
    • http://fruit-italy.space/73624232496jlxun.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/1e5eaf11-c6b5-4fc8-a4b5-a682f158bc41/jogusibom.pdfIn PDF document text
    • https://s3.amazonaws.com/desenaz/fopadiwedexizimozovorazof.pdfIn PDF document text
    • https://s3.amazonaws.com/gadumagabusodel/luzunisula.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3d87343d-fecb-4183-9fdb-07df56b7c170/temple_of_sulis_minerva_ac_valhalla_bug.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5e2b3bcb-52ff-4e32-933c-73cfd9670175/honeywell_thermostat_rth2300b1012.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/05f4485c-86e0-4b8b-8fba-9d07fb72e083/us_civil_war_short_summary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/94a26f11-61b3-4715-a5aa-3f7fc41a248c/35_hp_vanguard_oil_type.pdfIn PDF document text
    • https://s3.amazonaws.com/gixawetopoli/jijokuxefilupipo.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_off0000e1a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1A9 5448 bytes
SHA-256: 4eb260d286a4a82de176928afc8f438e9cd36c392774550815e23f1c994c1802
font_01_sfnt_off0000f456.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF456 11232 bytes
SHA-256: 5bc131f675046c185293241b40a2403bca378aa2c5f3b28aa46ffe56c97dc133