Malicious PDF — malware analysis report

Static analysis result for SHA-256 3921dbd8af11957c…

MALICIOUS

PDF

69.0 KB Created: 2021-03-25 03:33:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 67b6a2051caeb322a4d674216b6e388c SHA-1: 3e8f0a6e050a625cf9aec110ca5174b9183c98e1 SHA-256: 3921dbd8af11957cdb5ccc6994c27b4715a8a3ab54d64775bbd2fc4efdd80167
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 0.9996

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://druttle.ru/wix?keyword=8+keys+of+excellence+posters PDF link annotation
    • https://fexedewikefitug.weebly.com/uploads/1/3/2/6/132681233/53634b0ea4dca.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450145/normal_600fed68346bb.pdfIn PDF document text
    • https://busiwilepajij.weebly.com/uploads/1/3/4/3/134353274/5479729.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366398/normal_5fecb6387e5ae.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444657/normal_5fe9298134f6a.pdfIn PDF document text
    • http://ludipusoze.22web.org/how_to_make_a_cracked_minecraft_server_tlauncher_free.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478932/normal_60114a212fb01.pdfIn PDF document text
    • http://gaxesujite.medianewsonline.com/the_process_of_rational_reasoning_from_general_to_particular_case_is_known_as.pdfIn PDF document text
    • https://ropexosuwewi.weebly.com/uploads/1/3/1/3/131380205/146451f1d.pdfIn PDF document text
    • http://wazepewazivulil.mywebcommunity.org/4119927557.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372983/normal_6019bace3c043.pdfIn PDF document text
    • http://lenuvivureropi.scienceontheweb.net/plc_programming_jobs_in_sri_lanka.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://povasapodojika.epizy.com/98495201955.pdfIn PDF document text
    • https://ef4b221f-cfb4-47e8-bf1d-3b5092770df7.filesusr.com/ugd/4948da_50a8f355ac35493f9cc4764d31a52c11.pdf?index=trueIn PDF document text
    • https://11627308-8c8f-4f08-99ed-0ad85160907d.filesusr.com/ugd/682d1c_2447b4d31ffc49f5986fb07049fd22e0.pdf?index=trueIn PDF document text
    • http://kapirexazi.onlinewebshop.net/45894014112.pdfIn PDF document text
    • https://e06e8306-d71e-4c92-aa1b-e8c52eeb44cb.filesusr.com/ugd/bc4951_4a639420dd3440879f5bea407d1ad583.pdf?index=trueIn PDF document text
    • https://502f924d-676a-41b3-8220-87c01882f600.filesusr.com/ugd/5a20bb_c3dc3973624b41b980b1c1f8bfb24eaa.pdf?index=trueIn PDF document text
    • http://suzufesa.epizy.com/sojosofadujatu.pdfIn PDF document text
    • https://76bf09fe-c378-4d6f-baa9-beaf48595a8b.filesusr.com/ugd/61567a_f14df9b8b6ff4367bbc5c33281a5a006.pdf?index=trueIn PDF document text
    • http://pizitibasowu.atwebpages.com/xubobiromaxa.pdfIn PDF document text
    • http://kikanelomer.onlinewebshop.net/patepokit.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_off0000d123.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD123 5132 bytes
SHA-256: efaec16f4722f3ee85965a5757cf53cd8226fdf335e5cb423a240c3f985dd6f2
font_01_sfnt_off0000e2c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2C4 10412 bytes
SHA-256: 581f350999e5f0dcc7a532df9eba23165f402ecc2bcc45d99ccd8af296908e2d

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