Malicious PDF — malware analysis report

Static analysis result for SHA-256 83b7bebcf22a16f1…

MALICIOUS

PDF

62.0 KB Created: 2021-02-16 12:20:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-04
MD5: c44c8e7b66f54525d14d52577eb190bc SHA-1: 34c6da1eb3aa28b2a577d6e56c94c2c5d94200af SHA-256: 83b7bebcf22a16f1c934a1e2e325ef7b21f9810ad977d3bca2dafe96e91de73d
194 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://crophysi.ru/123?utm_term=best+quality+leather+ballet+flats In PDF document text
    • https://static.s123-cdn-static.com/uploads/4496607/normal_5ff5c779c2fc1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383681/normal_5fd0f4bcd23fc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478687/normal_5fd708dc588cc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368777/normal_6021fc1617696.pdfIn PDF document text
    • http://tlgfree.xyz/template_admin_css_freebuaer.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370560/normal_5fe421f3113ba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365580/normal_600a470edf645.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459319/normal_6004a46e35db5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372985/normal_60133f85c5edc.pdfIn PDF document text
    • http://pufufabimego.iblogger.org/android_annotation_processor_debug.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/boxujetanonikuv/86123151876.pdfIn PDF document text
    • https://s3.amazonaws.com/mogipegi/fukajupagagagudokud.pdfIn PDF document text
    • https://s3.amazonaws.com/zufaxepixiguxax/bamuvogovinemipexe.pdfIn PDF document text
    • https://s3.amazonaws.com/nefomojuwet/microsoft_excel_checklist_template_free.pdfIn PDF document text
    • http://pimudovi.epizy.com/nemoweruvujibosale.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_off0000b60c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB60C 5272 bytes
SHA-256: 69b2814829862c935d0c8dcd7cf568626f0bf227722f6370e19e558f5bd18769
font_01_sfnt_off0000c7ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7FF 9928 bytes
SHA-256: 0842ebfc41314ad654619dbdff1536905a22ae5408051079b6da36e5ce7b1ecf