Malicious PDF — malware analysis report

Static analysis result for SHA-256 169bf175ddc4a2a7…

MALICIOUS

PDF

69.6 KB Created: 2021-01-20 11:51:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 369ac0101bec5821d8aafd90f7d4bbea SHA-1: d43edd52902e66d032c6b258cf20f9eb2a51b1f7 SHA-256: 169bf175ddc4a2a7e27a75096b7294d3b2aed76f89ca29456e68173c03e73bd2
96 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains an embedded URI pointing to 'jacksth.ru', which is likely a phishing or malware distribution domain. The document body is heavily obfuscated, but the presence of external URIs suggests an attempt to redirect the user to a malicious site. No scripts were extracted, but the PDF structure itself facilitated the embedding of malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://jacksth.ru/123?utm_term=black+ants+and+buddhists+pdf PDF link annotation
    • https://cdn.sqhk.co/zipirevofu/B7Q1The/gizasorixutap.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367004/normal_5ff66c33888f5.pdfIn PDF document text
    • https://cdn.sqhk.co/gobisurav/hgW9jf2/looperator_vst_free_download.pdfIn PDF document text
    • https://cdn.sqhk.co/worenora/rvJjijf/59543511369.pdfIn PDF document text
    • https://cdn.sqhk.co/wefenosefob/iclnhfz/maxisys_ms906ts_printer_setup.pdfIn PDF document text
    • https://cdn.sqhk.co/xovujiroveg/N4ijgiU/ligazodiwugakowuvixekoba.pdfIn PDF document text
    • https://cdn.sqhk.co/liralimujote/hinhagi/43572305785.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422628/normal_5fa207ddaa4bd.pdfIn PDF document text
    • https://cdn.sqhk.co/regomesu/gjZ1OPc/business_development_manager_resume_description.pdfIn PDF document text
    • https://cdn.sqhk.co/giwumazusew/igbZlBp/hachiko_statue_tokyo_train_station.pdfIn PDF document text
    • https://cdn.sqhk.co/mixubiki/bBifvzK/hearts_of_iron_sabaton_wiki.pdfIn PDF document text
    • https://cdn.sqhk.co/govizanorev/9iouVcp/sonic_adventure_dx_mods.pdfIn PDF document text
    • https://cdn.sqhk.co/gonolesuzam/jib4Ghg/80945906174.pdfIn PDF document text
    • https://cdn.sqhk.co/jefapukawore/Pzhsij0/58583506979.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/ruzumeb/chevy_avalanche_2007_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/tonemakopinibem/91784657890.pdfIn PDF document text
    • https://s3.amazonaws.com/filidabut/wifugo.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_off0000d3c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3C7 5400 bytes
SHA-256: 7fa9bd674f9e7b8c02516bdec4326cbdba55fca9dcff6ae0daed430dea52ca27
font_01_sfnt_off0000e61e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE61E 10300 bytes
SHA-256: e5699408d2111512c27f4d455caea9e0c296b128f94d8e9c579675af1e1edecf

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