Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f3a9c25319a2c33…

MALICIOUS

PDF

77.0 KB Created: 2021-03-07 11:38:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 5583f443b6003f4a004c587392242ab3 SHA-1: 3ae09f43264bf7b4aed761b308d2357ee12f3b9a SHA-256: 7f3a9c25319a2c33a7ca232e22fc8635896c61172d913679923d124a5291f515
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9998

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://jumiwimov.ru/wix?keyword=mac%2527s+hair+cutting PDF link annotation
    • https://cdn.sqhk.co/vaminika/heFderD/89298739659.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408471/normal_6003459ecce5a.pdfIn PDF document text
    • http://redatimiwanal.iblogger.org/zedofigibuxusa.pdfIn PDF document text
    • http://puwuditufu.22web.org/xbox_360_jtag_beginners_guide.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377109/normal_603341e7dd459.pdfIn PDF document text
    • https://cdn.sqhk.co/zebimapajod/MhjS7mJ/pk_xd_hack_mod_apk_2020_latest_version.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459027/normal_5fc6db0369770.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413563/normal_6003eef076c9b.pdfIn PDF document text
    • http://gitamoravazini.22web.org/42140324484.pdfIn PDF document text
    • http://ravovenovibu.medianewsonline.com/pioneer_avh-x3700bhs_memory_full.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
    • http://jonesojawu.myartsonline.com/gmat_mock_test_free_gmatclub.pdfIn PDF document text
    • http://zubiluwetij.myartsonline.com/88098577182.pdfIn PDF document text
    • http://banitazivi.epizy.com/pdf_file_free_online.pdfIn PDF document text
    • http://jimomurapujivo.onlinewebshop.net/12754516930.pdfIn PDF document text
    • http://vexabimumemig.atwebpages.com/horus_heresy_false_gods_review.pdfIn PDF document text
    • http://jowosos.myartsonline.com/bose_wave_music_system_3_service_manual.pdfIn PDF document text
    • http://vexabimumemig.atwebpages.com/nedaviburege.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e6c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6C8 4724 bytes
SHA-256: 98c9ee4de76e36c3fb2ad5a1be32eb9b08373d923f005aa0e4d9d09214e83686
font_01_sfnt_off0000f6c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6C6 10096 bytes
SHA-256: 90c00891a4c143a6db8e7ab9d011e5db6ef9fce48dc467d2a0a3ca78b927ad8b
font_02_sfnt_off00011950.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11950 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3