Malicious PDF — malware analysis report

Static analysis result for SHA-256 e39522d54b285e2e…

MALICIOUS

PDF

88.0 KB Created: 2021-03-08 15:02:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: e5246ff122e072c81627c4891cb5511e SHA-1: 9987004df436b13073a2105cbae624788b6e77cc SHA-256: e39522d54b285e2e0f68c478f1f523071f1ac641d692a1ad6ffff8abf5aaa0c7
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm designed to redirect users to potentially harmful content. The presence of embedded URLs and the overall structure strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://zajinet.ru/123?utm_term=krystal+burger+nutrition+guide PDF link annotation
    • https://cdn.sqhk.co/pifizumux/YXhHhf8/chapter_4_quiz_answers_cisco.pdfIn PDF document text
    • https://cdn.sqhk.co/xumobopore/ghhhDgf/pastel_tie_dye_crocs_canada.pdfIn PDF document text
    • https://cdn.sqhk.co/vuzonabudad/qrYgfl6/rubel.pdfIn PDF document text
    • https://cdn.sqhk.co/reriwoduriju/aihtvib/download_game_ultimate_offroad_simulator_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/bufudoraxala/rgfDEgd/science_museum_vr_viewer_app.pdfIn PDF document text
    • https://cdn.sqhk.co/vonezositixi/dfQzQjh/xoranobo.pdfIn PDF document text
    • http://xrootunited.com/psychiatric_mental_health_nursing_certification_review_book2dy4x.pdfIn PDF document text
    • https://cdn.sqhk.co/kutajanode/ibicPih/white_siberian_husky_puppies_for_sale_near_me.pdfIn PDF document text
    • http://idealica-italiaoficial.site/the_scarlet_pimpernel_movie_2013d934o.pdfIn PDF document text
    • https://cdn.sqhk.co/zuronenom/dUoifji/30812515119.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
    • https://855e1e5b-0daf-4dce-aa73-dfad2bfec5df.filesusr.com/ugd/ced2dc_e2c041662653410dab2c00972a5e4f75.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vebisop/98114251376.pdfIn PDF document text
    • https://fac30f9c-1bc3-4ff6-ac40-7ced1d2a170b.filesusr.com/ugd/3b7182_ef8d2fecf1dc4ff2aef3d7bde42aacf1.pdf?index=trueIn PDF document text
    • https://46c0acaa-de7d-4f46-84f0-c2cf1d8ff7d9.filesusr.com/ugd/ac1638_4969b96de2ec4d6ca024e7d2faa5e339.pdf?index=trueIn PDF document text
    • https://40e214c1-1950-44e8-a195-e2c6eeb23253.filesusr.com/ugd/a517f4_e73a82e96f884a9f836000847227a377.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/guwutivupudutu/windowbuilder_eclipse_zip.pdfIn PDF document text
    • https://s3.amazonaws.com/fomudebipefasu/17239659982.pdfIn PDF document text
    • https://s3.amazonaws.com/pizexopenaxu/rojowuwukef.pdfIn PDF document text
    • https://s3.amazonaws.com/kavifunaruvi/22780633321.pdfIn PDF document text
    • https://s3.amazonaws.com/zurovajij/a_r_c_launcher.pdfIn PDF document text
    • https://s3.amazonaws.com/moduxanakuri/bigasoft_video_converter.pdfIn PDF document text
    • https://s3.amazonaws.com/bisazabe/90233855098.pdfIn PDF document text
    • https://s3.amazonaws.com/babetafaperaxov/aambala_movie_songs_free.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f5a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5A4 5084 bytes
SHA-256: 3f8ceed1624c9c7014e8f117a4f1e4157c8c41fc315c0663057a45502c680c10
font_01_sfnt_off000106ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106FF 12060 bytes
SHA-256: 2b52e301d9ff6190382d9fa58b7446edf3ee00f62798ff7bb672c4dc03f0f2c2
font_02_sfnt_off00012eef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EEF 16060 bytes
SHA-256: 503f5200e83b189a546b6c6e1d808633a9135186956fe76ff9bd78de3d91e3c6
font_03_sfnt_off00014387.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14387 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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