Malicious PDF — malware analysis report

Static analysis result for SHA-256 25fe60b73a6dcaf8…

MALICIOUS

PDF

95.4 KB Created: 2021-05-28 06:59:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 04af82e05e47e3713513ec3cb23a91ec SHA-1: afbfdf9e71f69b7ba92807b12113f609ecdfc47e SHA-256: 25fe60b73a6dcaf815f127e126780976fa67acc8552e37c8e916cad435e1b6a1
186 Risk Score

Malware Insights

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

The sample is a PDF file identified as malicious by ClamAV and an ML classifier. It contains a significant number of external links, many hosted on disposable domains, indicating a link farm designed to redirect users. The presence of 'utm_term=antivirus+kaspersky+android' in one URL suggests a potential lure related to security software. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://dugedepap.ru/123?utm_term=antivirus+kaspersky+android PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4447434/normal_602e7fc45dfda.pdfIn PDF document text
    • https://perikoweb.weebly.com/uploads/1/3/5/2/135297066/gakexisujep.pdfIn PDF document text
    • https://lerexujirizafet.weebly.com/uploads/1/3/4/3/134344290/2324065.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417314/normal_5fe359f908d37.pdfIn PDF document text
    • https://bevozuvegala.weebly.com/uploads/1/3/3/9/133999301/nusebexux.pdfIn PDF document text
    • https://sesejeku.weebly.com/uploads/1/3/4/4/134495796/luxuzimaxiw-bewalafufuzusu-zasetuxij-teterinubu.pdfIn PDF document text
    • https://mozurizubomexaj.weebly.com/uploads/1/3/4/6/134643417/3936800.pdfIn PDF document text
    • https://mirulunus.weebly.com/uploads/1/3/1/1/131164386/madimiba.pdfIn PDF document text
    • https://xonalofogikovor.weebly.com/uploads/1/3/4/3/134372302/6553838.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478685/normal_602fc9e790182.pdfIn PDF document text
    • https://ruzejeparofilag.weebly.com/uploads/1/3/4/5/134582671/1280.pdfIn PDF document text
    • https://nojugebi.weebly.com/uploads/1/3/4/3/134321301/1218746.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451736/normal_5fe6138253af9.pdfIn PDF document text
    • https://divuvefa.weebly.com/uploads/1/3/4/7/134759037/ac90d2ff430a0a.pdfIn PDF document text
    • https://minezutoka.weebly.com/uploads/1/3/2/6/132695516/5fd5f.pdfIn PDF document text
    • https://foxewazijibaj.weebly.com/uploads/1/3/1/3/131379544/6749654.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/8f9f8816-4c9d-4770-a1f4-749256a485f2/jidijabipedazesezij.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5002344a-19aa-476c-9e2c-6a644ba0d539/samsung_bd-j5700_not_working.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b5983ac8-beca-49b0-be9c-5f2717f186b8/54841499655.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/101529e6-3013-4114-93bc-6b67fcc1146c/98546052408.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4626bdca-dc7e-4a78-a9b3-fb2f0a74860a/91248622207.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d900386a-3721-4009-8a37-0c5751527a78/kesuzazaxusasusabop.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_off000138e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138E0 5136 bytes
SHA-256: fcb7f8438dd27d118e61c2978f05f1c5517f581fe7ed312275b7545a19caadd4
font_01_sfnt_off00014a78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A78 11072 bytes
SHA-256: 77e3f4ca8783129035b28430474df32d680ed7aef08a25633438a3494853af5f