Malicious PDF — malware analysis report

Static analysis result for SHA-256 b33737b1b9f02535…

MALICIOUS

PDF

71.6 KB Created: 2021-02-12 00:54:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: dbb490db4279a117beeb23233053e905 SHA-1: 56ecff3e8cb3a0189e33bba14c239ddf3e73687c SHA-256: b33737b1b9f02535553ab0bae767993e9a55ec17730a9a7a6923178357b42176
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 0.9997

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://jacksth.ru/wix?keyword=different+conflicts+in+the+yellow+wallpaper PDF link annotation
    • http://maporivibadiwaj.iblogger.org/53302595218.pdfIn PDF document text
    • http://x-bionic.shop/android_9_dark_theme_samsung3k5e2.pdfIn PDF document text
    • http://sokfresh.fun/video_maker_app_free_download_apkptqtc.pdfIn PDF document text
    • https://cdn.sqhk.co/mesodimeduje/XLdBrjm/checklist_for_task_listing_agent.pdfIn PDF document text
    • https://saxeguwub.weebly.com/uploads/1/3/1/4/131406831/c87f31.pdfIn PDF document text
    • https://jajaleregonu.weebly.com/uploads/1/3/4/2/134235513/8042437.pdfIn PDF document text
    • http://jnatural.space/38219172257cgk1v.pdfIn PDF document text
    • https://fijuvosezo.weebly.com/uploads/1/3/4/0/134096395/fewewatumen_vivowesajik_sojar_tunif.pdfIn PDF document text
    • https://depagolal.weebly.com/uploads/1/3/0/8/130813973/2353039.pdfIn PDF document text
    • http://naturalik.fun/plan_anual_trabajo_comision_tecnico_pedagogicowqunj.pdfIn PDF document text
    • http://form-lnstagramcopyrightservices.com/fenolosazk37pl.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vebavibokifoko.epizy.com/auto_chess_origin_apk.pdfIn PDF document text
    • http://jibipadesubamom.epizy.com/guided_busway_route_r.pdfIn PDF document text
    • http://kokalukavevip.epizy.com/zoxugogefoguxo.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_off0000dd51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD51 5296 bytes
SHA-256: 7fd58e9175904575e3c5908dc48730c5bd92b38c1b5cbca3dc385fc054198392
font_01_sfnt_off0000ef76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF76 10020 bytes
SHA-256: 1893b6521d36ce4cee5b17efc89110669f18d45674c44c0a56addd3b4aaa4b80