Malicious PDF — malware analysis report

Static analysis result for SHA-256 26a3b2e0929702ec…

MALICIOUS

PDF

72.1 KB Created: 2021-06-10 22:19:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: e3d703b6f5dee0cb5354125938d0fb97 SHA-1: 0d4652104ab4e2c67c87af60999ee9301729ae84 SHA-256: 26a3b2e0929702eca0ee6b24616aedf51d0129c0a7463b6f372b482b2fd7b40b
134 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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 and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://chcial.ru/pbw?utm_term=adding+and+subtracting+integers+word+problems+worksheet PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4449987/normal_606538b05b81f.pdfIn PDF document text
    • https://wodarobasuk.weebly.com/uploads/1/3/5/3/135300597/2569839.pdfIn PDF document text
    • https://sawuvuvexefiz.weebly.com/uploads/1/3/5/9/135964560/19921a8eb8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4493916/normal_5fe59af15c6a7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413110/normal_6057f2cfb9ba6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489839/normal_6024182621929.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413693/normal_5fe99b9b06c02.pdfIn PDF document text
    • https://simejozegedofu.weebly.com/uploads/1/3/4/3/134359486/jakaluradonoxa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://farejutotej.pbworks.com/w/file/fetch/144662661/64461590343.pdfIn PDF document text
    • http://rimikupababo.pbworks.com/w/file/fetch/144537066/99386979473.pdfIn PDF document text
    • http://fepewuwakow.pbworks.com/f/wobapimomupapot.pdfIn PDF document text
    • http://zorisomofi.pbworks.com/f/85466266229.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/02fd54f8-e69b-463c-83c4-f67d106988c9/are_hot_tub_control_panels_interchangeable.pdfIn PDF document text
    • http://fuvesiwowegu.pbworks.com/w/file/fetch/144639105/what_is_section_503_of_the_rehabilitation_act_of_1973.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d6ed62a8-ef51-4220-9604-3f12dad1b40c/whirlpool_gold_quiet_partner_iv_clean_filter.pdfIn PDF document text
    • http://niluputevi.pbworks.com/w/file/fetch/144590970/sowenepadizaketobevu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3ba27370-a2b7-42d1-940e-a26d4d607469/suraxukuka.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_off0000dc23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC23 5772 bytes
SHA-256: 5ec701be1b37d92fe9476705bea975fca6aedf1209180e04711f251844d9d698
font_01_sfnt_off0000efaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFAF 10112 bytes
SHA-256: 6e3f37ecd56d6b2272ba851c0191f7a5e22c257e94a865fdcfd6c273e7c86cc5

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