Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a91f4da7de6ff8f…

MALICIOUS

PDF

82.6 KB Created: 2021-03-16 06:04:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: ff42740c88950d0f4f571c642dd1522b SHA-1: 598b58aa3a4ecc02c2ce0c7b6a93fe2ecfda647e SHA-256: 8a91f4da7de6ff8f028f67e4a6c3c9bc9110c8090f254a6a5b4e056a30655de2
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://bologen.ru/award?keyword=teori+urbanisasi+pdf PDF link annotation
    • https://cdn.sqhk.co/depivuni/cwMibpH/fancy_names_for_the_color_green.pdfIn PDF document text
    • https://xunilizavokuniz.weebly.com/uploads/1/3/6/0/136050149/8a0b16c6a8cdc6.pdfIn PDF document text
    • http://tertov.xyz/adding_and_subtracting_rational_numbers_worksheet_with_answersq6dnd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418175/normal_5fe47e73239fd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450340/normal_5fdbafbea3307.pdfIn PDF document text
    • http://pozijuza.scienceontheweb.net/10948611920.pdfIn PDF document text
    • https://cdn.sqhk.co/pafitevet/g6vCEoZ/joomla_bootstrap_4_template_free.pdfIn PDF document text
    • http://ro-shop.space/8215824094314sgs.pdfIn PDF document text
    • https://nuzosobife.weebly.com/uploads/1/3/4/7/134734795/118561.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383295/normal_604666f094b80.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4530036/normal_600c5fa46ffb0.pdfIn PDF document text
    • https://cdn.sqhk.co/zubejavaxuvu/foNSghZ/83614700706.pdfIn PDF document text
    • https://powipawi.weebly.com/uploads/1/3/4/3/134313445/0c99fb33c.pdfIn PDF document text
    • http://medtechnika1.ru/vujepalefonezekulojwwpgk.pdfIn PDF document text
    • http://myfoxing.online/wexopaxedanizqlgr.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377414/normal_60360b5a9b8c2.pdfIn PDF document text
    • http://muzibatixabu.mypressonline.com/56380291628.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://755d026c-fd58-4633-9ca9-8af24261f473.filesusr.com/ugd/4622eb_af52ac6cd81346b09e8fea25229f1de3.pdf?index=trueIn PDF document text
    • http://safedoguno.onlinewebshop.net/tawojinobepugefuwakanufa.pdfIn PDF document text
    • https://1c54689f-8f60-44d8-8d81-b144d6ea8ada.filesusr.com/ugd/787b0a_3b25f9d0479e446fa038e7e34ada73cd.pdf?index=trueIn PDF document text
    • https://4454cc88-256b-48ad-9013-c0414c72072d.filesusr.com/ugd/67e251_f6a8d403f01948f8837aa29cbeb73369.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_off00010873.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10873 5092 bytes
SHA-256: 17c9b93d48c0ed519de877d37853efeddeb9dc564a843e815d400901ef7d8f9e
font_01_sfnt_off000119c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119C8 10448 bytes
SHA-256: ccc1f02113f859b0995766c2869f9d9682d42e5e35fd6b7dfa18b57aa08b5a53

Open this report in the interactive analyzer, or submit your own file for analysis.