Malicious PDF — malware analysis report

Static analysis result for SHA-256 11aa84469722c940…

MALICIOUS

PDF

75.8 KB Created: 2021-06-03 19:58:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: d7fd0d5d59c168c9f2cec8b4d2fe1902 SHA-1: cfb60492fdffadf7a352b631b04adcfbc94f5309 SHA-256: 11aa84469722c94062099ce71a79cbb7bd5b34778db5bc6cc83bc5b9f479f6f2
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 0.9997

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://zajinet.ru/123?utm_term=peter+jackson+king+kong+ps2 PDF link annotation
    • https://lekofubazag.weebly.com/uploads/1/3/1/8/131872104/0869ad53826a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387229/normal_5fd832c45ee72.pdfIn PDF document text
    • https://wisukasef.weebly.com/uploads/1/3/1/4/131453855/ef3af7.pdfIn PDF document text
    • https://zejewovelopitut.weebly.com/uploads/1/3/0/8/130813539/romitefuveba.pdfIn PDF document text
    • https://ripabefemedoge.weebly.com/uploads/1/3/4/3/134321398/kurazaxazuretuj.pdfIn PDF document text
    • https://rupusuji.weebly.com/uploads/1/3/4/8/134878943/fawixige_wumovunore.pdfIn PDF document text
    • https://bulipabuwalo.weebly.com/uploads/1/3/4/1/134131868/zutawiwazidite.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403406/normal_5ffb3f139f844.pdfIn PDF document text
    • https://poxofosu.weebly.com/uploads/1/3/4/3/134308827/2940681.pdfIn PDF document text
    • https://dikijezirepa.weebly.com/uploads/1/3/2/8/132815872/2483619.pdfIn PDF document text
    • https://befepoli.weebly.com/uploads/1/3/4/6/134687110/d5a16.pdfIn PDF document text
    • https://varukixenusenat.weebly.com/uploads/1/3/4/7/134700479/7e01f3bc588a0.pdfIn PDF document text
    • https://nivojekegup.weebly.com/uploads/1/3/5/3/135322075/04c564.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379048/normal_605cb581bf1a0.pdfIn PDF document text
    • https://xereritotof.weebly.com/uploads/1/3/1/0/131070340/cdfa17315.pdfIn PDF document text
    • https://tunedewujanan.weebly.com/uploads/1/3/5/3/135345761/3082faf157.pdfIn PDF document text
    • https://tunegize.weebly.com/uploads/1/3/4/5/134500295/2067194.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/28743745-578d-40ff-a9d2-2ef55a2877f4/fimekirojuzovuvoj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/648c3511-06ef-4d39-98a8-8511accc6335/do_xbox_360_controllers_work_on_xbox_one.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/24c600ce-4117-4135-84c9-f3f5924f1638/asp.net_identity_tutorial_mvc_5.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/93fb8ba5-fe27-4a1b-8f7a-71999376dc51/ditali.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_off0000eb9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB9E 5340 bytes
SHA-256: d1f4ad550e8b584fc97f668e0d5cf0bb736324574589199c1f181cd8c38a4924
font_01_sfnt_off0000fdec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDEC 10632 bytes
SHA-256: 75a925ca07dec78aee6f94424a97164d22aa2245b3b104d3e3933f8047d3b281

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