Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e4a596d2548e37b…

MALICIOUS

PDF

77.0 KB Created: 2021-01-27 12:51:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 4b33c5967bce8e848eb8ec8bdf508e17 SHA-1: 621d4228d67b5d711c601aecd7d45b8efc1f4bf6 SHA-256: 3e4a596d2548e37b5f026c7a84386be3de9d5049b4edb14cc59ba6a2b39aa88b
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The document contains numerous embedded URLs pointing to various domains, suggesting it functions as a link farm or a distribution point for malicious content. The presence of external URIs and the 'link farm' heuristic strongly suggest the document is designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://traffset.ru/wb?keyword=face%20masks%20for%20sale%20made%20in%20usa PDF link annotation
    • https://cdn.sqhk.co/rifokinimito/giPqhal/pentagon_jr_mask_buy.pdfIn PDF document text
    • https://cdn.sqhk.co/dekaroku/ZjcgcyM/at_t_prepaid_customer_service.pdfIn PDF document text
    • http://websporizlehd.com/bitmoji_chrome_extension_on_ipad1bqgf.pdfIn PDF document text
    • https://vugogirofezufus.weebly.com/uploads/1/3/4/3/134355312/4375930.pdfIn PDF document text
    • https://kudilasiwutoxe.weebly.com/uploads/1/3/5/3/135314551/0414243f217409.pdfIn PDF document text
    • https://cdn.sqhk.co/dezorevukor/Tjegege/zajitujutozili.pdfIn PDF document text
    • http://smeh-mif.space/72742775206bh0qi.pdfIn PDF document text
    • https://wufezaju.weebly.com/uploads/1/3/0/7/130738917/34738d452.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417139/normal_600bca5149ca5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489598/normal_5fd62e1b4401b.pdfIn PDF document text
    • http://load-bcp.com/frank_wood_business_accounting_12th_edition_free_downloado9rhm.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4474206/normal_5fecc486b6b19.pdfIn PDF document text
    • http://peskomment.ru/54614893632omkt7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4466146/normal_5fdd935b7aea2.pdfIn PDF document text
    • https://paruralevefux.weebly.com/uploads/1/3/0/7/130775474/8586107.pdfIn PDF document text
    • https://cdn.sqhk.co/letojeka/iiSk0QS/power_wheels_jurassic_worldtm_dino_racer.pdfIn PDF document text
    • http://probmake12.xyz/89767675919tvscc.pdfIn PDF document text
    • http://marinarus.space/private_caller_saint_pepsi_lyricsw9ix3.pdfIn PDF document text
    • http://easylearning.space/carriage_crossing_apartmentsw0n5e.pdfIn PDF document text
    • https://fiwisito.weebly.com/uploads/1/3/4/7/134715438/4673368.pdfIn PDF document text
    • http://visiblawty.com/rogexebepejemsgid2.pdfIn PDF document text
    • http://svoydvalend.xyz/fuxutunorogenelubijinezitxtl0j.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://femodizabofowu.epizy.com/ielts_reading_test.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_off0000ec95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC95 5184 bytes
SHA-256: 75f587241ce79738e2528e5241e4990a7fb5038d44fdd6a4c1d6018bf2eaaf05
font_01_sfnt_off0000fe26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE26 12032 bytes
SHA-256: 52f2cfff9d78be53a1325ef34f6346a61a322bb21d511bb325353f9d3fc9c0e2

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