Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b1e4bcf8260c55f…

MALICIOUS

PDF

79.2 KB Created: 2021-02-20 12:22:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 1b38912b02bd8d477c1a70222765ec44 SHA-1: e54c44840af243ce066f446fad8246c9963621d7 SHA-256: 1b1e4bcf8260c55f250dedfafe1b3dc7583d9865aeb496913045f227af0eb397
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links are characteristic of malicious documents designed to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://crophysi.ru/123?utm_term=what+is+machine+learning+with+example PDF link annotation
    • http://shtangennstutkupitseychas.xyz/geri_s_game_plot_diagram_answersrc354.pdfIn PDF document text
    • https://fakilopatezi.weebly.com/uploads/1/3/1/6/131606638/5077028.pdfIn PDF document text
    • https://xevefozivoro.weebly.com/uploads/1/3/5/3/135339272/1888757.pdfIn PDF document text
    • http://allwoman.site/zed_aram_guide_euwau8du.pdfIn PDF document text
    • http://madamzero.com/understanding_culture_and_sensitivity_reportsa96y8.pdfIn PDF document text
    • http://prodson.space/8005278974981xn.pdfIn PDF document text
    • http://pycnidwzxc.info/steampunk_puzzle_brain_challenge_physics_game_answers2d51m.pdfIn PDF document text
    • http://topdiscount.pro/mefarijisulimenumutuxukathmvke.pdfIn PDF document text
    • http://honey-love.ru/907219688565bmjc.pdfIn PDF document text
    • http://tertov.xyz/condom_size_guide_width2fehb.pdfIn PDF document text
    • http://50offit.pro/rubadigefemif1fn.pdfIn PDF document text
    • http://constructionhouse.info/how_to_remove_carburetor_from_briggs_and_stratton_riding_lawn_mowerguep9.pdfIn PDF document text
    • http://presente-top.store/648417553331f888.pdfIn PDF document text
    • https://jodaxirijiv.weebly.com/uploads/1/3/0/7/130776114/jerapamokuzegoguk.pdfIn PDF document text
    • http://carbags.site/sopulerexnzk.pdfIn PDF document text
    • http://itash.space/oldies_music_station_seattlekmqcf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://napipipazapuka.epizy.com/molecular_geometry_worksheet_vsepr_theory.pdfIn PDF document text
    • http://sivebiza.epizy.com/catholic_super_forms.pdfIn PDF document text
    • http://gorulilul.rf.gd/pink_t_shirt_template_back.pdfIn PDF document text
    • http://fididebezewigex.epizy.com/69129348347.pdfIn PDF document text
    • http://vunibem.epizy.com/4218569889.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_off0000f830.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF830 5520 bytes
SHA-256: 54ffed392bd259f31afc61b6f3ad8e5e73f8db8921c4d741e3e634ae966ddf14
font_01_sfnt_off00010ae8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AE8 10628 bytes
SHA-256: 338188fddbb2004ada3dae025651ade5949e258824bbf3a49976951a60ab2735

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