Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef41dfbc152e82b2…

MALICIOUS

PDF

82.8 KB Created: 2021-03-17 05:29:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 1ae1ee7493a50a3793d503fdf1fa1d53 SHA-1: 92dfb7a48e1d7fa7f56ebf5cad4572dc4293e329 SHA-256: ef41dfbc152e82b2bd54d75a054328f0d210759c8bd987e3fb72c3edafee5434
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-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://dugedepap.ru/wix?keyword=download+unblocked+games+for+pc PDF link annotation
    • http://wuwudikosegukem.mypressonline.com/assessing_critical_thinking_skills.pdfIn PDF document text
    • http://mekomob.getenjoyment.net/samsung_scx-3405fw_driver_windows_8.1.pdfIn PDF document text
    • http://faripofijukevom.mywebcommunity.org/30823460313.pdfIn PDF document text
    • https://bulodogezuso.weebly.com/uploads/1/3/4/8/134868115/4133742.pdfIn PDF document text
    • http://zifeladawu.scienceontheweb.net/48564812522.pdfIn PDF document text
    • https://wudowured.weebly.com/uploads/1/3/0/8/130873715/xefexeduluri.pdfIn PDF document text
    • http://vubitim.sportsontheweb.net/diccionario_acadmico_de_americanismos.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/54d6f2d1-6b4e-4596-bd7c-ed34997972d9/75046103992.pdfIn PDF document text
    • https://f579be4a-c2ec-451d-94ee-532237c06880.filesusr.com/ugd/9f6a24_56334a92362646bc9b811d2b3b695275.pdf?index=trueIn PDF document text
    • https://ce55c564-0e79-48ac-bd91-a034cff8554b.filesusr.com/ugd/bd1fc0_4401f893b395430a9771e089dbd1e971.pdf?index=trueIn PDF document text
    • https://1ebfeea1-7d02-43b8-8f0a-002c87bc7f75.filesusr.com/ugd/50dcf6_5c4efaf774a647b3a255a958b19b5ce0.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0c469330-6fd8-439d-b310-8e04d4528bed/flowers_for_algernon_audiobook_part_1.pdfIn PDF document text
    • https://f84ffea9-2755-49c2-9cb5-47ca8b55fe65.filesusr.com/ugd/0adedf_e03cb473d14d46a1a0bba512288aa7f0.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ffea5a99-63e7-43b1-a167-bee0fac1780f/idylis_freezer_model_if71cm33nw_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3ff0b7a6-8f25-430f-9a76-9f1f0efd7c88/how_to_reset_technicolor_router_tg588v.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8cc6eeec-b01f-4368-9849-33d6d7663864/dyson_cinetic_big_ball_animal_allergy_upright_vacuum_nickel_refurbished.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a61426ea-6c9c-412b-93bb-410f674b5454/tesarusukerofutur.pdfIn PDF document text
    • https://s3.amazonaws.com/fifuto/gupulorimekowamokejumun.pdfIn PDF document text
    • https://s3.amazonaws.com/dujepav/the_office_meme_template.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/103be29f-4b4b-4eda-91e3-399ddd6eb983/41380758831.pdfIn PDF document text
    • https://13cfbe10-32e4-4d7a-9072-8dbd3280e6b8.filesusr.com/ugd/994e9e_d5b1e7b2b47e4c4991de263e01055dd9.pdf?index=trueIn 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_off000103a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103A3 5768 bytes
SHA-256: 7e1557a2160215f9bbf40837c480ac5edc547cf47b1dcd8f852e2017ee15d559
font_01_sfnt_off0001174f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1174F 11420 bytes
SHA-256: f987cc56508a80a53c43ea538887bf04aa7f2d0f2ade3a84923ec34cfbeb60ed

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