Malicious PDF — malware analysis report

Static analysis result for SHA-256 765fe31cfd09b663…

MALICIOUS

PDF

80.7 KB Created: 2021-02-20 15:10:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 0ac57c712ae1891033da79658e294781 SHA-1: ae017465d1b217d50cb134a59a3b6cdb696962d5 SHA-256: 765fe31cfd09b663b120be9ee8b7cf8664bbf5b845813033b173eae5413d6f5f
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a technique often used for SEO poisoning or to redirect users to malicious sites. The heuristic PDF_SEO_LINK_FARM indicates a large number of external links, and one specific URL, https://druttle.ru/wix?keyword=dyson+hot+and+cold+purifier+manual, is directly embedded. ClamAV also detected this file as Pdf.Phishing.Trojan, further supporting a malicious classification. No scripts were extracted, but the overall structure and embedded URLs suggest a phishing or malware distribution attempt.

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://druttle.ru/wix?keyword=dyson+hot+and+cold+purifier+manual PDF link annotation
    • https://vudulami.weebly.com/uploads/1/3/5/9/135964857/7141646.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370525/normal_601a30ac2d67a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404740/normal_5fdd3e2614071.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478131/normal_6007f18de7b86.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366982/normal_601a061b79a96.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485943/normal_5fd1ec17c6ee3.pdfIn PDF document text
    • https://cdn.sqhk.co/pavoraxebute/iirq0if/nuwojo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472186/normal_60223c416b12f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422373/normal_5fdefb6b3b76e.pdfIn PDF document text
    • https://cdn.sqhk.co/kizofapekeku/eidieji/jafelilelatojepiragog.pdfIn PDF document text
    • https://cdn.sqhk.co/dowusutitozi/hfUhjha/75453727953.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460950/normal_600d0de903722.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446151/normal_6017c6b42f933.pdfIn PDF document text
    • https://cdn.sqhk.co/mojupesonon/qgJhhWh/tennessee_titans_calendar_2019.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460465/normal_60240cef24626.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/gopuze/62411428275.pdfIn PDF document text
    • https://s3.amazonaws.com/fovezewi/arthashastra_book_in_gujarati.pdfIn PDF document text
    • https://s3.amazonaws.com/dipafuxe/yealink_t21_e2_datasheet.pdfIn PDF document text
    • https://s3.amazonaws.com/xalexojaxipud/avatar_maker_terbaik_android.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA6E 5496 bytes
SHA-256: 058ff3238b5ee104be8ccef7faf7742443f1ead7d13cddb0708dc7443344c884
font_01_sfnt_off0000fd01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD01 2168 bytes
SHA-256: 224dfc1c4c166ba1dd370a93ff9e22fd9f28ee6fbbe7e759ed3b181a6ed8618c
font_02_sfnt_off00010660.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10660 15280 bytes
SHA-256: c687130fff25cdac50dc5c2cdfccf442ef237d8d8a24c8488aff60f6b5114a2f

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