Malicious PDF — malware analysis report

Static analysis result for SHA-256 451757f9d7681c62…

MALICIOUS

PDF

81.1 KB Created: 2021-02-17 12:56:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-10
MD5: d695435129941cb0b8fbc0c5d9d7b660 SHA-1: 60a7a5ab42308a3f98e5fcda6241fc0aebe74701 SHA-256: 451757f9d7681c62a95f6fee0d85a809cbd0b0fce765a1ee456e8cb0f9811278
254 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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.
  • 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://yafferge.ru/wb?keyword=how%20many%20types%20programming%20languages In PDF document text
    • https://cdn-cms.f-static.net/uploads/4368781/normal_60205b51b3508.pdfIn PDF document text
    • http://voyazh-shina.com/eugenia_brasiliensise2xre.pdfIn PDF document text
    • http://agentsecure.space/35034976796tar2w.pdfIn PDF document text
    • https://tavutafaj.weebly.com/uploads/1/3/1/4/131482866/rugofowakuzu.pdfIn PDF document text
    • http://flash-sar.online/wewutilenikikifuzukw8fr8.pdfIn PDF document text
    • https://nukusuruv.weebly.com/uploads/1/3/1/8/131857442/00338ec.pdfIn PDF document text
    • http://electorat.org/futawiipamj.pdfIn PDF document text
    • http://raisinshq.pro/15438175259ykhmh.pdfIn PDF document text
    • https://sivisobimiji.weebly.com/uploads/1/3/4/7/134754783/fabanurakudo-ronokodurufarab-vujogojeveba-folurekerupux.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/zepifudoxapo/rototipedadelow.pdfIn PDF document text
    • https://s3.amazonaws.com/zowibatev/archer_c59_manual.pdfIn PDF document text
    • http://volajigatume.epizy.com/simple_meditation_techniques.pdfIn PDF document text
    • https://s3.amazonaws.com/gixawetopoli/peloton_android_app_release_date.pdfIn PDF document text
    • https://s3.amazonaws.com/tozaduliwubega/14532432206.pdfIn PDF document text
    • https://s3.amazonaws.com/vovuzize/rivaxabive.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_off0000fbf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBF2 5292 bytes
SHA-256: a3193b073019058d485c0e0ecaf8315c2d8bb8e638032e1e32fc5103dd9ff428
font_01_sfnt_off00010df3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DF3 12444 bytes
SHA-256: 84b3acc56c43a5c2dd7c89312e13d493d7956abdd5be62d29281bc2934057fd8

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