Malicious PDF — malware analysis report

Static analysis result for SHA-256 578cd96411fcb40e…

MALICIOUS

PDF

78.0 KB Created: 2021-02-12 15:21:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 68ef98f92b9f96312ecfe60c5603be90 SHA-1: 2083b8a682372f728bea746d030407b2a29e3909 SHA-256: 578cd96411fcb40eccb531bb119e15b8d7c4c8d2744681237323bc2e88d39397
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 0.9996

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://jottigo.ru/123?utm_term=osprey+pdf+vk PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4408997/normal_6016c5d890c4e.pdfIn PDF document text
    • https://tazuwadafif.weebly.com/uploads/1/3/4/8/134857375/660636.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410217/normal_5ffd3f606c4fd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427523/normal_60110ec0a4112.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457582/normal_6021f9121a0c9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378405/normal_60160611c3394.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451018/normal_5fc5df2d7ad13.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471985/normal_5fc6bdc689441.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486200/normal_6012e1f69269e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448746/normal_60117c38d18c2.pdfIn PDF document text
    • http://damisidituwupo.iblogger.org/five_characteristics_of_an_effective_business_report.pdfIn PDF document text
    • https://jewadasin.weebly.com/uploads/1/3/4/6/134604584/8798979.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475379/normal_5ff19ca93c523.pdfIn PDF document text
    • https://rumitubo.weebly.com/uploads/1/3/4/5/134525427/rejipuzefux-dagepuxuxifu-xivemep-buzuruxunenapog.pdfIn PDF document text
    • https://tatedugede.weebly.com/uploads/1/3/4/3/134311852/c971e3b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pomababotesu.rf.gd/sipanugulovujekaxirulez.pdfIn PDF document text
    • http://gagisejokunego.rf.gd/minodovodiwazizo.pdfIn PDF document text
    • http://famowasaj.epizy.com/52029991333.pdfIn PDF document text
    • http://faxaxesaxejov.rf.gd/wolipiriwibasuvo.pdfIn PDF document text
    • http://dowijasimenazo.epizy.com/mazekagijupozinab.pdfIn PDF document text
    • http://mamitepibo.epizy.com/adithya_varma_movie_trailer.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_off0000f55d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF55D 5048 bytes
SHA-256: 68a82bdec06b648696d5b5dc10c5d782fce8d299d477e1b3cd7312dbfc676b89
font_01_sfnt_off000106ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106AC 10500 bytes
SHA-256: 40f66a04d5bccfea9c8b09efc6a375db93b32b8962b5f4ddf57c842ee8b0dda4

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