Malicious PDF — malware analysis report

Static analysis result for SHA-256 847cc5fd3bcdeff9…

MALICIOUS

PDF

86.6 KB Created: 2021-02-22 17:15:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: fb965614b153f4525e6e785f2a1befe5 SHA-1: 314b62e3b2e36a3d9ab3d2a6ed972a5f06ba6738 SHA-256: 847cc5fd3bcdeff92dc9dce12a9799e85f2d3c0b4f0245b500a915a046379b10
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with one prominent URL pointing to a suspicious domain ('jacksth.ru') that appears to be part of a link farm designed to redirect users. The document body, though heavily obfuscated, contains references to audio equipment, suggesting a lure to disguise the malicious intent. The presence of multiple disposable domains and link farms indicates a phishing or malware distribution campaign.

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://jacksth.ru/strik?utm_term=axe+fx+3+vs+kemper+2020 PDF link annotation
    • http://ru-1.casa/superhero_wallpaper_hd_download_for_android_mobiletkjvs.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459337/normal_601b08a17d3fc.pdfIn PDF document text
    • https://lerofiputa.weebly.com/uploads/1/3/4/3/134367001/gabupan_napuriwuw.pdfIn PDF document text
    • http://in-arenas.com/sonapawufepgiz3.pdfIn PDF document text
    • http://lazadacostumercenter.com/hollywood_reporter_most_trusted_news_anchorsrxvsl.pdfIn PDF document text
    • https://dapazigozasonim.weebly.com/uploads/1/3/4/4/134466252/2152890.pdfIn PDF document text
    • https://milikosepawina.weebly.com/uploads/1/3/2/6/132696406/1132022.pdfIn PDF document text
    • https://nugiwilog.weebly.com/uploads/1/3/1/3/131384260/bijimutilipot.pdfIn PDF document text
    • http://vvinorama.fun/fesaxizinekexomidumekim7stt.pdfIn PDF document text
    • https://fefokivaz.weebly.com/uploads/1/3/0/7/130776727/sokuful-narurugagurur-bupezakafusox-vimivosubidaraw.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/kifutizijebuj/sesoliripetebugofasewus.pdfIn PDF document text
    • https://s3.amazonaws.com/vuzufexarevima/fm_whatsapp_app_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/fuwenoxuzasila/jomisipekuxir.pdfIn PDF document text
    • https://s3.amazonaws.com/nemafu/53163251231.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_off0001145d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1145D 5424 bytes
SHA-256: fd8581f662bc11bea073fe7de3e9684ce038e1e5440a34244d38a881554b4e2b
font_01_sfnt_off000126d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126D9 11368 bytes
SHA-256: 62456ab37c17993ec022fffa764cf50ce66a0ffc31c45b58aa179434b7151cbb

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