Malicious PDF — malware analysis report

Static analysis result for SHA-256 8637f5f7cece356c…

MALICIOUS

PDF

68.2 KB Created: 2021-03-28 05:10:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: cebe297d5e27e5524e17d98b3f8b3875 SHA-1: 33ffa11c6a6f9494acfd4499495414e27fc7d01a SHA-256: 8637f5f7cece356c7fc53895a9d1b0c9ba4bbb52290bcb1394f2b7edd2bd8058
126 Risk Score

Malware Insights

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

The PDF file contains heuristics indicating it is a link farm on disposable hosting, with a high ML score and ClamAV detection for a phishing trojan. The embedded URL points to a suspicious domain, likely serving as a lure for malicious activity. Although no scripts were explicitly extracted, the PDF structure and associated URLs strongly suggest a phishing or malware distribution attempt.

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://lozipotod.ru/123?utm_term=cat%25C3%25A1logo+de+c%25C3%25A9dulas+do+brasil+pdf PDF link annotation
    • http://xinumazujo.iblogger.org/what_order_should_i_read_the_warcraft_books.pdfIn PDF document text
    • https://xelopapet.weebly.com/uploads/1/3/0/7/130775154/todidomagat.pdfIn PDF document text
    • https://cdn.sqhk.co/bazurara/jNzJgi8/appium_inspect_elements_android.pdfIn PDF document text
    • https://nakidero.weebly.com/uploads/1/3/4/5/134524904/kugod-voduzizumetadev-tabovamixu-zunoxazi.pdfIn PDF document text
    • http://pelaberofusej.iblogger.org/ascaris_lumbricoides_2020.pdfIn PDF document text
    • https://zumegopepotiko.weebly.com/uploads/1/3/1/3/131398003/kamogutizise-buzex-bukozawipujez.pdfIn PDF document text
    • https://cdn.sqhk.co/dojaxeje/cijijgd/funny_meme_gifs_clean.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/275ed29f-1835-4e3f-9695-fe03501738b0/ashton_kutcher_and_mila_kunis_that_70s_show.pdfIn PDF document text
    • https://a815f367-2516-4b88-9496-eed07d5c1eb7.filesusr.com/ugd/665c20_bb43506f26fa43bf9c47ff38ac8e079c.pdf?index=trueIn PDF document text
    • https://70fbc5f3-53e4-4072-9ff7-a5862d19847b.filesusr.com/ugd/bb3bf9_dc2a04f60b1949a3b86a373abd8ab992.pdf?index=trueIn PDF document text
    • https://cd65756b-a9c7-4cca-9498-1747a6459195.filesusr.com/ugd/05eb20_c4842398a98441d5af124481960679ce.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0a88d05b-9cd0-431f-ae79-5324ee56f416/fz_old_version_bike_mileage.pdfIn PDF document text
    • http://waxetip.rf.gd/37578217932.pdfIn PDF document text
    • http://vunolipatebaw.rf.gd/what_is_art_integration_in_philippine_arts.pdfIn PDF document text
    • http://kugunimekuxaf.epizy.com/filupubirixisug.pdfIn PDF document text
    • http://tedajeti.rf.gd/cascada_de_coagulacion_modelo_celular.pdfIn PDF document text
    • http://tabikobi.epizy.com/lozokedonariwudew.pdfIn PDF document text
    • http://rinodinejepezoj.rf.gd/determinacion_de_coliformes_totales_en_alimentos.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_off0000c7a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7A5 5744 bytes
SHA-256: 55fe026ab18352da88ce58a85c575e9c1203fc0c2e99b87c7ad7a82c6c2676de
font_01_sfnt_off0000da55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA55 13172 bytes
SHA-256: 297c19b9d3ff4da6a4a9c945c09a3e3f23700aae2db54d6323b25ca88a088aa2

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