Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e4067fa5c936ee5…

MALICIOUS

PDF

72.0 KB Created: 2021-01-28 07:20:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 37300dfa84fd675cc9f031cd8436079e SHA-1: 2f1f250b3d6864f5f27aa0828125e948066a61e7 SHA-256: 3e4067fa5c936ee5ae34e4968cea44eeada4d64d0e70879b634c7a3e9fb7560e
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by multiple heuristics, including ML and ClamAV, indicating malicious intent. It contains numerous external URIs, with one prominent URL being https://druttle.ru/123?utm_term=science+rubric+4th+grade, suggesting a phishing or malware distribution lure. The PDF's structure and embedded links point towards it being a link farm designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://druttle.ru/123?utm_term=science+rubric+4th+grade PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4470027/normal_5fca9843b7fc1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426682/normal_5fe53fdd35ac2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369343/normal_5fecceefa7a3f.pdfIn PDF document text
    • https://kusafulidofet.weebly.com/uploads/1/3/4/0/134017607/1310004.pdfIn PDF document text
    • http://wellwork.site/718542344011md4h.pdfIn PDF document text
    • http://usmileofficial.site/bigfoot_hunter_game_online0x07a.pdfIn PDF document text
    • http://kino-vezde.ru/zetevudovhzdp3.pdfIn PDF document text
    • https://tiwoboromezusud.weebly.com/uploads/1/3/0/8/130874009/tumerulo_judijakasizap_bajozejolad.pdfIn PDF document text
    • https://detawokigar.weebly.com/uploads/1/3/1/4/131453745/tazegijoxinikub_jivezagez.pdfIn PDF document text
    • http://kwini-fini.online/dreamville_sacrifices_instrumental_mp3_downloadouh89.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458854/normal_600dfbb2ae640.pdfIn PDF document text
    • http://3gusevshop.website/gazekosesixox4hzcl.pdfIn PDF document text
    • https://xigeworimejol.weebly.com/uploads/1/3/1/4/131483719/8627087.pdfIn PDF document text
    • https://debuvubuni.weebly.com/uploads/1/3/4/8/134846467/relokupi.pdfIn PDF document text
    • https://balesiloruj.weebly.com/uploads/1/3/4/6/134671801/kiligudamigifona.pdfIn PDF document text
    • https://situzofunuk.weebly.com/uploads/1/3/5/3/135305293/rilimag.pdfIn PDF document text
    • http://sportplays.ru/adorable_home_update_bedroom_mod_apk3zikm.pdfIn PDF document text
    • http://ompala.store/49er_drive_in_theater_sacramento0ivte.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/fonazuzixagizir/rugododumul.pdfIn PDF document text
    • https://s3.amazonaws.com/liguwubore/85743425590.pdfIn PDF document text
    • https://s3.amazonaws.com/nefomojuwet/wojufepuf.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_off0000dd18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD18 5324 bytes
SHA-256: 89978246dbb4196c6c2a7b8421a5c823c49ab36d20f0e92d7ec77aa08055f9b4
font_01_sfnt_off0000ef30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF30 10376 bytes
SHA-256: dc3143aa9da4f97abc9b51d20a3eb64cefef60a9690c89034509ca04f869d1de

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