Malicious PDF — malware analysis report

Static analysis result for SHA-256 c21a0fb715c37774…

MALICIOUS

PDF

94.2 KB Created: 2021-03-14 18:26:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: dfa8a6aafa41ab8338419380bdb8fc67 SHA-1: ef5bad94f64b1aa58cd6c1bb283cd0bb174fd4f7 SHA-256: c21a0fb715c37774ca5dfac8bc88fa995d039dc1e826e714a8f20d06a32e0dc5
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 0.9997

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://xezojetit.ru/123?utm_term=calibration+procedures+for+measuring+instruments+pdf PDF link annotation
    • http://redita.fun/ancient_greek_olympics_worksheets01oei.pdfIn PDF document text
    • https://cdn.sqhk.co/kekelivig/7tdjchg/lanor.pdfIn PDF document text
    • https://cdn.sqhk.co/jojevirelo/xvgjhb8/push_box_casual_puzzle_game.pdfIn PDF document text
    • http://raisinshub.club/rulidu3sr92.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4503987/normal_5fe78fb2b72c6.pdfIn PDF document text
    • http://vvvvvvvvvvvvvvvvvvvvvb.xyz/zigarizewadibofufifet8ddq5.pdfIn PDF document text
    • http://nakanilo.club/what_is_a_programmable_logic_controller_plc_quizletlyoam.pdfIn PDF document text
    • http://gogotmif.space/77019250892o533e.pdfIn PDF document text
    • http://unityfree.xyz/harry_potter_1_streaming_youwatchmb69e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380411/normal_60003087550df.pdfIn PDF document text
    • http://help-business-media.com/finding_area_and_perimeter_of_irregu01eon.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://e1bd05e7-a2ed-43df-b5fc-9bc8ee0b1a84.filesusr.com/ugd/08acf3_80126700a5954daabbb41e76dcb04a9f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/garorowa/what_is_the_main_plot_of_les_miserables.pdfIn PDF document text
    • https://72858ab8-d36f-4bc2-b208-e5ec56e76d01.filesusr.com/ugd/3a4e0e_59a95d44d3a5465fa2cd28b0db9c9d9b.pdf?index=trueIn PDF document text
    • https://ff4d9611-e7ea-45f2-85d3-f0b464ef817f.filesusr.com/ugd/48f461_67ace67c8f174dd5b2d92cc8b00a5d1a.pdf?index=trueIn PDF document text
    • https://88211235-bf86-4d40-a6ec-a052db2f682e.filesusr.com/ugd/94e5ef_4a29575544a646f68f1250f5d69bbea4.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jimugivos/bully_lite_size_200mb.pdfIn PDF document text
    • https://s3.amazonaws.com/xuzakob/10417816900.pdfIn PDF document text
    • https://s3.amazonaws.com/buwosevax/krups_beertender_b95_for_sale.pdfIn PDF document text
    • https://s3.amazonaws.com/xufoxorog/vilomolofumoluzoluvamona.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000122c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122C0 5520 bytes
SHA-256: 4c0f96753c09070edd0103bad28f06c6f67a2d932c6fbc67ad8431361f819ff0
font_01_sfnt_off00013560.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13560 12148 bytes
SHA-256: 332effb40e212a782f0ae8d62aedaf97b788cbb6594889366eaed3aa34e00322
font_02_sfnt_off00015d6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15D6A 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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