Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5c607bcd15897ce…

MALICIOUS

PDF

103.4 KB Created: 2021-03-23 08:42:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: c622e0de8deb6b6b7a71ab6744fad912 SHA-1: 8cbf80a3fa9e9092073a3e3c4feb7ed60abf42df SHA-256: a5c607bcd15897ceff03f8e8881be0f30482f752acbd9b6ff5cad459d85117c3
186 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. 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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://mezovuduw.ru/wix?keyword=circle+of+the+land+druid+5e+guide PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4421767/normal_60401b86b00f5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379733/normal_6054f714508ae.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485157/normal_60302d66ea5ce.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500440/normal_60464c2d11b9b.pdfIn PDF document text
    • https://cdn.sqhk.co/pujixefan/hP8Psji/11749488151.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486374/normal_5fe819d70fb5e.pdfIn PDF document text
    • https://lapaluletegole.weebly.com/uploads/1/3/4/6/134679291/zakedutosipow.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446774/normal_601a5b6ce3285.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4458852/normal_5ff19c95c4c0e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450640/normal_603b3fb51c7e8.pdfIn PDF document text
    • https://cdn.sqhk.co/zezetemirag/hhbH6gd/2107.pdfIn PDF document text
    • https://gekaketiba.weebly.com/uploads/1/3/1/4/131455198/tukexojovutuvep.pdfIn PDF document text
    • http://jotewelife.iblogger.org/angolan_house_music_free.pdfIn PDF document text
    • https://cdn.sqhk.co/bupitagalir/7QEnhds/agriculture_in_tamil_language.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/22ac1eea-625a-4269-8509-ca4532500b1b/sudabogaxuzujek.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3497bddf-e2f5-4df0-8ed7-21ead9275041/paparazzi_concord_ma_phone_number.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/315827f2-6f4e-4bfc-8d62-8717ed17512f/whirlpool_wher25_reverse_osmosis_water_filtration_system_troubleshooting.pdfIn PDF document text
    • http://gozipoxux.rf.gd/3m_tape_catalogue.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_off000159e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x159E8 5136 bytes
SHA-256: 978d93e3b67aa493204995b620651953e2091a70668ff42b5c2110039e8853a8
font_01_sfnt_off00016b5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16B5B 10932 bytes
SHA-256: 42e4d9619b3d375ef417c22fc88513025bb26f823f6bd4f5699d45ddfb0ed093

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