Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f5c8564f6a68c18…

MALICIOUS

PDF

110.6 KB Created: 2021-02-01 06:46:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 47e888724800d75316453d7b8f46dc4c SHA-1: 53803f1dfe3bdba092e49ef8eb99af72b996e32a SHA-256: 8f5c8564f6a68c189f10b8fb263950589c6feb6341d8bbb71275ce003f86b297
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical alert for linking to known malicious redirector infrastructure. The embedded links, such as 'https://yafferge.ru/123?utm_term=hardy+elementary+school+principal', are designed to lead users to potentially harmful content. The document's structure and numerous links suggest a phishing or scam attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/123?utm_term=hardy+elementary+school+principal In PDF document text
    • https://cdn.sqhk.co/migazajigum/f5hh3c8/pubg_mobile_zombie_infection_mod.pdfIn PDF document text
    • https://cdn.sqhk.co/sasibasodiwu/dhehgtl/sapopokukigogapugazizin.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384642/normal_60129ba1a1dab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482020/normal_600fd743e1d05.pdfIn PDF document text
    • https://zozolunefa.weebly.com/uploads/1/3/5/3/135325744/9382622.pdfIn PDF document text
    • http://golesaluwo.66ghz.com/linekageneriponevavu.pdfIn PDF document text
    • https://veriketosamu.weebly.com/uploads/1/3/4/6/134675732/zafojewuvasibosugomo.pdfIn PDF document text
    • https://cdn.sqhk.co/pabelewexo/e26gjI4/66212860459.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380680/normal_600e7ff9d0ae1.pdfIn PDF document text
    • https://xewaxamuroz.weebly.com/uploads/1/3/4/5/134529724/9397334.pdfIn PDF document text
    • https://dovejopizodumu.weebly.com/uploads/1/3/4/8/134883147/mofoxit.pdfIn PDF document text
    • https://ruwiderok.weebly.com/uploads/1/3/4/8/134891429/vewexonije.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://koxowasone.epizy.com/vevurala.pdfIn PDF document text
    • https://s3.amazonaws.com/sepovutapakogaf/wuposigigafuzebotukorekeg.pdfIn PDF document text
    • http://jupejorix.epizy.com/dovezasanizolikil.pdfIn PDF document text
    • http://fikikozazilut.rf.gd/bookworm_adventure_crack.pdfIn PDF document text
    • http://wupewujivijulo.epizy.com/calendario_maggio_2018_da_stampare.pdfIn PDF document text
    • http://jeburam.epizy.com/addition_and_subtraction_worksheets_for_second_graders.pdfIn PDF document text
    • http://fafovinipola.epizy.com/cacahuates_garapiados.pdfIn PDF document text
    • http://duxuramubot.epizy.com/acetone_chloroform_azeotrope.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_off00017096.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17096 5376 bytes
SHA-256: 0145063b649bdc1108feb973e60883843b1a6b5ef396c54f258679d559e7c466
font_01_sfnt_off000182be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x182BE 12456 bytes
SHA-256: 82906a66c878b44ee9370128e5c3fabb0f78e14316fabd9fbebbd44cfebddbfc

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