Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4e2d168d41852ee…

MALICIOUS

PDF

81.9 KB Created: 2021-02-16 01:01:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 0a7989fb0c66d5b166d0162dc8a45c5b SHA-1: 68b2bec872c23879ae998a5065278197733d1805 SHA-256: f4e2d168d41852ee776d196a8b8ccabc8e50a020d9a3e145e463fac5a7047ba5
156 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, identified as a PDF link farm, which is a common tactic for SEO manipulation and malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or trojan delivery. The embedded URLs, such as 'https://maypoin.ru/wb?keyword=martha%20page%20hartford%20food%20system', are suspicious and likely lead to malicious content.

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://maypoin.ru/wb?keyword=martha%20page%20hartford%20food%20system PDF link annotation
    • http://tumbochka.space/49927963563p7rbu.pdfIn PDF document text
    • http://fb-copyright-help-from.com/4472537212029afv.pdfIn PDF document text
    • https://likeledizu.weebly.com/uploads/1/3/5/3/135312051/92bcc171b.pdfIn PDF document text
    • https://lamixanusagexog.weebly.com/uploads/1/3/5/3/135317293/6d542ea.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494883/normal_601f0fe43588f.pdfIn PDF document text
    • http://healthit.space/bubble_games_for_androidkbqwj.pdfIn PDF document text
    • https://cdn.sqhk.co/pozigafo/gjhehdX/blood_pressure_cuff_manual_cvs.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388426/normal_5fd8cd0c9bc86.pdfIn PDF document text
    • https://cdn.sqhk.co/risubibasero/rxjdhdO/vip_health_care_dog.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379471/normal_5fc8d09cd7a82.pdfIn PDF document text
    • http://kostlike.site/19283999683zpkhq.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/nigimul/free_motion_for_continuance_template.pdfIn PDF document text
    • https://s3.amazonaws.com/jarawaxanivu/japan_work_visa_application_form.pdfIn PDF document text
    • https://s3.amazonaws.com/gixirojozogufux/svr_secret_video_recorder_free.pdfIn PDF document text
    • https://s3.amazonaws.com/turip/wogipupisito.pdfIn PDF document text
    • https://s3.amazonaws.com/rirusozo/52000639180.pdfIn PDF document text
    • https://s3.amazonaws.com/kozewuposoridil/29615603769.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_off0000ecc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECC6 5164 bytes
SHA-256: b710ec32cc6c79f7417ff8f5a06c214f5ba09a3a95b8f57bb355c98cf28a722e
font_01_sfnt_off0000fe6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE6B 14508 bytes
SHA-256: 256b8ce672a960ab0416a4d0168a9bf423a0e11a6e7de300636d28ff8299c747
font_02_sfnt_off00012c51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C51 4324 bytes
SHA-256: 8405bb6ca9a6fb718a2e910e1cdde4d74ac2122cab0061dc5f772322db9c7ccd

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