Malicious PDF — malware analysis report

Static analysis result for SHA-256 17d39902586dacbd…

MALICIOUS

PDF

72.6 KB Created: 2021-06-11 21:03:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 239a9e46c29c7c197545ce36be2ced13 SHA-1: 0a13c65bafddd58912190510f64ce1ab1dbb5454 SHA-256: 17d39902586dacbd618f53eae5605ac1cfbf0ab57469b54b22c26c40fcce1595
146 Risk Score

Malware Insights

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

The PDF file contains embedded URLs and heuristics indicate it functions as a link farm, directing users to potentially malicious sites. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. The primary IOC is the suspicious URL found within the document.

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 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://infrive.ru/pbw?utm_term=windows+7+ultimate+x64+iso+download PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4452595/normal_606980708801f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414353/normal_6013d84855eac.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384639/normal_5fef0d53d14ef.pdfIn PDF document text
    • https://ratopavitakam.weebly.com/uploads/1/3/4/4/134460251/guvafufuzabisa.pdfIn PDF document text
    • https://degumikiw.weebly.com/uploads/1/3/4/7/134724061/a37145e7c88a.pdfIn PDF document text
    • https://wuxijize.weebly.com/uploads/1/3/4/6/134685372/zasekuparot.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370064/normal_6066e42b5a9a5.pdfIn PDF document text
    • https://divuleveberu.weebly.com/uploads/1/3/7/5/137502180/refemovuvow.pdfIn PDF document text
    • https://zadumujiz.weebly.com/uploads/1/3/4/6/134626950/xodal.pdfIn PDF document text
    • https://kigadipokifexi.weebly.com/uploads/1/3/0/8/130813079/b6a50dc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387704/normal_602ae0331f0f9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mupalunava.pbworks.com/w/file/fetch/144580023/libro_de_rinoceronte_resumen.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/30e3274a-1862-471f-a7bc-6c51d4d6f074/first_things_first_meaning_example.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a059f3d5-38d6-447f-beba-4d4227006be4/befosom.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fc9427b4-de3e-4090-9706-61d566c62405/sifeduzabetedelugozixu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/13676ebd-6b61-4d68-9963-370069c2a795/72152546756.pdfIn PDF document text
    • http://wexagiz.pbworks.com/w/file/fetch/145062807/76161076540.pdfIn PDF document text
    • http://lodedeti.pbworks.com/w/file/fetch/144940911/1028961555.pdfIn PDF document text
    • http://buluwogot.pbworks.com/f/10344308573.pdfIn PDF document text
    • http://sikawejedi.pbworks.com/w/file/fetch/144628278/13485500916.pdfIn PDF document text
    • http://zalonuzojeru.pbworks.com/w/file/fetch/144562983/rarerireziraxako.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_off0000dfa2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFA2 5372 bytes
SHA-256: db9667ecb2e06ac6c59e0b6138e434d00ab21ef940d3727f7244ea4d8059c1cc
font_01_sfnt_off0000f1fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1FC 10164 bytes
SHA-256: 154099e9d7ec345e4c1d5d66e87798c44f0b4cc4299defd514eaafe605a47bf3

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