Malicious PDF — malware analysis report

Static analysis result for SHA-256 f23a3b793f3ebcd6…

MALICIOUS

PDF

73.3 KB Created: 2021-03-23 07:01:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 88034ca01bf91b3f3e1e82eaee97971c SHA-1: 58ca9143734fddce5d73a84fb4f3f19bcf2c3287 SHA-256: f23a3b793f3ebcd692f184aedca2e999b26a6a8337fffe50fb9d0a92fe25f18c
126 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9992

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/award?keyword=zelda+breath+of+the+wild+guide+book+pdf PDF link annotation
    • http://uchebnoe.website/36977996138wdmv2.pdfIn PDF document text
    • https://cdn.sqhk.co/xawobovuji/tnhhgiJ/53912561310.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420600/normal_60554ab4558ae.pdfIn PDF document text
    • https://cdn.sqhk.co/xonepogafix/7hj69ib/vixavotemug.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365612/normal_60374adb3ea44.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393208/normal_5fe593bc0eb42.pdfIn PDF document text
    • http://fifamarketbot.com/xodeninijuvodorapesemptys.pdfIn PDF document text
    • http://jobauthor.online/povijumeguxevesunejesa216.pdfIn PDF document text
    • https://cdn.sqhk.co/gipekoma/dbibtSC/bhojpuri_video_film_tubidy.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488817/normal_5fff3f56a97fb.pdfIn PDF document text
    • http://peuer.xyz/66760015520jzfgm.pdfIn PDF document text
    • https://cdn.sqhk.co/gaxazazul/heUgenL/great_little_war_game_free_download.pdfIn PDF document text
    • http://futup.ru/ronoxasepertad8.pdfIn PDF document text
    • https://cdn.sqhk.co/vedanoderifu/giaifjh/gikefomizuri.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4506200/normal_5febc6c39e6f5.pdfIn PDF document text
    • http://investmag.org/pogotovamorakosuloscpgoz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://229c3593-bb94-4e5d-9b9f-ca3747df48ef.filesusr.com/ugd/145364_cc7083073360492886b3b9448ba9b304.pdf?index=trueIn PDF document text
    • https://945c5b1a-9feb-4a08-b72d-c905ca1b1520.filesusr.com/ugd/27135d_c7377f0d188348838904bee5c25fa839.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9e004190-3467-45e5-81d9-079580fa86e9/89583083391.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3838d6f5-4edf-4297-8669-86958101adca/70092929421.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f4715b85-06e7-41af-aef0-0c4449ad14be/what_is_the_importance_of_transformational_leadership.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/feb8836b-bbc2-4c4c-b804-b05da758ba48/asus_p7p55d-e_lx_sound_drivers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/523f819c-dfe8-496d-b513-1a75477277a9/sansa_mp3_player_manual.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_off0000dde9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDE9 5376 bytes
SHA-256: 3b96ba9fefbd7e6b0060660301f6cdea3dd07781ff64a47d61de8a43fb452fde
font_01_sfnt_off0000f044.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF044 11144 bytes
SHA-256: db692760f729015eda3dfdfcc8e74001f19d5ba524502951b96220c4efdbcbbe

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