Malicious PDF — malware analysis report

Static analysis result for SHA-256 edb6871e0d9bbdfe…

MALICIOUS

PDF

75.8 KB Created: 2021-02-18 16:19:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: b351094462e382846e08042c75280739 SHA-1: dec9d0614f0cd8099fc8453912064c4ac796cae1 SHA-256: edb6871e0d9bbdfe2c16edcbe4b3be6be1700d5d0d73ff92ff1dcbda671ad7ec
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous external links, with one heuristic specifically identifying a 'PDF_SEO_LINK_FARM' containing 30 external links. The presence of a malicious ML classification and ClamAV detection further supports its malicious nature. The primary malicious URL identified is https://jottigo.ru/strik, which is likely used to redirect users to a malicious site or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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/strik?utm_term=mcgraw-hill+education+certificate+ge%25C3%25A7erlili%25C4%259Fi PDF link annotation
    • https://menesifewo.weebly.com/uploads/1/3/0/8/130814293/kinejofinetawub_kipevarapu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370317/normal_5fe2f6fadb016.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4443341/normal_60067338523db.pdfIn PDF document text
    • https://fekazivijiwawad.weebly.com/uploads/1/3/4/6/134687088/8a869e4a9fb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412388/normal_5ffad98faee18.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451365/normal_5ff5fad78315a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413707/normal_5fd8ef4af21a2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454673/normal_5fe6259e0db1b.pdfIn PDF document text
    • https://kezidixujaroko.weebly.com/uploads/1/3/4/0/134040737/205292e73da8.pdfIn PDF document text
    • https://cdn.sqhk.co/mupijuwo/ZA8icgh/diwopivabonip.pdfIn PDF document text
    • https://musisemikalig.weebly.com/uploads/1/3/4/6/134694348/4f4275a45ca2a.pdfIn PDF document text
    • https://suwelebebos.weebly.com/uploads/1/3/5/9/135959353/4210429.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468537/normal_601745028ed73.pdfIn PDF document text
    • https://cdn.sqhk.co/sesijisova/jhf4Vgd/libikufakoterepod.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/sepovutapakogaf/new_information_about_neet_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/takebemanijewok/vegejologovi.pdfIn PDF document text
    • https://s3.amazonaws.com/rilexazejuzovep/i_am_britney_jean_documentary.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_off0000e6fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6FE 5648 bytes
SHA-256: 78cd1930b94cb3e51f652cbb4cc46bab6f3e4c7e273676acd8a932ba5a579600
font_01_sfnt_off0000f997.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF997 10992 bytes
SHA-256: eaf178669668c0384ba103e883896b747e7d160c0f047fc68f4589cc1d146ade

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