Malicious PDF — malware analysis report

Static analysis result for SHA-256 bff54c4e1b822651…

MALICIOUS

PDF

76.2 KB Created: 2021-03-27 18:12:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 1bc5101671251e640a12115da1185820 SHA-1: 975078cbf5bdef51c420015b1ddb7e5490fe9127 SHA-256: bff54c4e1b82265197a91b474e0553a7ac8f8cafe4cc52dbdc27f79c57ea32dc
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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://maypoin.ru/wix?keyword=wtfock+season+2+episode+7+english+subtitles PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4392210/normal_6022e814a0793.pdfIn PDF document text
    • https://bujefodamefizup.weebly.com/uploads/1/3/1/0/131070612/xenowapomomefup_jodupebi_sojufas_matokapileweku.pdfIn PDF document text
    • https://dunokosira.weebly.com/uploads/1/3/5/3/135349308/jezojanofeloxumimomi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462037/normal_5ffe16e6b1c77.pdfIn PDF document text
    • http://100naturals.fun/23281241056ymna0.pdfIn PDF document text
    • http://hookup666.site/267137169822ar9e.pdfIn PDF document text
    • http://santand-es.com/bepobelavupuxbn5.pdfIn PDF document text
    • http://umkatrade.ru/criterios_de_la_primera_y_segunda_de2w491.pdfIn PDF document text
    • http://megalit-korolev.ru/varulutxvbez.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4401515/normal_5ff46c80c0da8.pdfIn PDF document text
    • http://waxinexedodupij.22web.org/lejodelexidi.pdfIn PDF document text
    • https://webapifupa.weebly.com/uploads/1/3/4/7/134706955/9cf536.pdfIn PDF document text
    • https://vabisoxapulaji.weebly.com/uploads/1/3/4/4/134444495/5900004.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://ebc1add8-0b9d-418e-9e4a-1e287827e933.filesusr.com/ugd/ab63e3_bfc456d264ac454e9216a5222abcacc0.pdf?index=trueIn PDF document text
    • http://wosoremozojofam.epizy.com/34271295088.pdfIn PDF document text
    • https://849cba27-c1c2-4801-a47f-514a08c45c3c.filesusr.com/ugd/7f7a2c_318375a8e7654f889acedcab370b45ab.pdf?index=trueIn PDF document text
    • https://8fa10226-37c2-454d-bd65-ced70ecbf0c4.filesusr.com/ugd/c34aa9_81f7f8c06b4c48bda7d10d71874fe9fb.pdf?index=trueIn PDF document text
    • https://f5f74d4f-f804-4d9b-9bfa-9964b2756261.filesusr.com/ugd/e389b3_6cf557fe96014d14a810d31bfc9bddfd.pdf?index=trueIn PDF document text
    • https://a5fc3680-5c08-4cda-bd6c-abaa3bdf25bc.filesusr.com/ugd/ea5d7b_fa3b6dd82d614b16aa32e65c36c86e93.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_off0000e3fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3FB 5748 bytes
SHA-256: a76de869fb8cbc3263c789fc9b36d60d99d948b23d62852096ff2edf772ef5a5
font_01_sfnt_off0000f7b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7B3 13892 bytes
SHA-256: 218b2119e57b66582f4ec7e9448dd41a957c696c9342c48ef2570a6215813dbe

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