Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0822b8a652fb6d5…

MALICIOUS

PDF

83.4 KB Created: 2021-03-24 16:12:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: f964a7c71954deae1e2525ab42aef109 SHA-1: 70f6ae7439f3cf562e9dbaece342e441b07381bd SHA-256: a0822b8a652fb6d58b5fe38bfaf5c2df2087839072a2505efc28b8c90bea2023
186 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links pointing to various external websites, many hosted on disposable domains. This behavior is indicative of a link farm or a phishing campaign, aiming to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent.

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://jacksth.ru/wix?keyword=warrens+curio+guide PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4462727/normal_602d89f2a4664.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387050/normal_5fd67ceae2457.pdfIn PDF document text
    • https://taxurazuzar.weebly.com/uploads/1/3/4/0/134042721/gefine.pdfIn PDF document text
    • https://ruvavaru.weebly.com/uploads/1/3/0/8/130874457/9744d71b78f5.pdfIn PDF document text
    • https://zapeledi.weebly.com/uploads/1/3/5/3/135314532/25d3eebafe.pdfIn PDF document text
    • https://balabirow.weebly.com/uploads/1/3/4/6/134690292/kolebi.pdfIn PDF document text
    • https://kodetowunim.weebly.com/uploads/1/3/4/7/134701578/bbe89f76.pdfIn PDF document text
    • https://tezilejesitox.weebly.com/uploads/1/3/1/1/131163634/59ded9c28.pdfIn PDF document text
    • http://gufurebu.medianewsonline.com/tazeteloguvupojibesitosi.pdfIn PDF document text
    • https://zorajifedimak.weebly.com/uploads/1/3/1/4/131437130/8288681.pdfIn PDF document text
    • https://jabevemejo.weebly.com/uploads/1/3/1/4/131483275/kamixumafotolirun.pdfIn PDF document text
    • https://bigifami.weebly.com/uploads/1/3/1/4/131407708/9dd4cbfbc0fc0f2.pdfIn PDF document text
    • http://wasatosu.sportsontheweb.net/xifomuzizazur.pdfIn PDF document text
    • https://kefapadasogimok.weebly.com/uploads/1/3/4/6/134601884/209e8434f8584.pdfIn PDF document text
    • https://zizeximafebofiz.weebly.com/uploads/1/3/4/3/134369397/2a605623e95c7d4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472774/normal_600e3f5791de7.pdfIn PDF document text
    • https://niraxonaweza.weebly.com/uploads/1/3/4/0/134000156/4337940.pdfIn PDF document text
    • https://kezidixujaroko.weebly.com/uploads/1/3/4/0/134040737/97ea707e4e613b3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kilarosine.atwebpages.com/gipegudakigabegagowi.pdfIn PDF document text
    • https://45dcde1a-aed5-4138-b95e-a0f768a283bf.filesusr.com/ugd/89441e_e8c2343e52174075b2c65ea9140a21de.pdf?index=trueIn PDF document text
    • https://a4758657-6aaa-4003-b0f6-1957e800abfd.filesusr.com/ugd/70c1f8_f54670d1e78d470f9a3965eb031830cc.pdf?index=trueIn PDF document text
    • http://siniligavaxuvul.onlinewebshop.net/24883640920.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_off00010a06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A06 5088 bytes
SHA-256: 7ab161ea99e6aca31572480ac4dd57e02717b9540b5737da25d0a214a98fef36
font_01_sfnt_off00011b6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B6C 11028 bytes
SHA-256: 542f8e6b110b81cbc4523f11f83b48a2a9c33d01b06d706694de6647f2927c16

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