Malicious PDF — malware analysis report

Static analysis result for SHA-256 af9e597e82acf678…

MALICIOUS

PDF

64.3 KB Created: 2021-02-06 08:51:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-25
MD5: a2bb5ae069a95e5d16df6daf90e759cb SHA-1: f463760342d0ade065a8662b04bedeae460fe073 SHA-256: af9e597e82acf678222c8d10c99e48af2213f97b788b5ef0e7e9618fe1bdb117
254 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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://crophysi.ru/aws?utm_term=arya+malayalam+movie+ringtone+free In PDF document text
    • https://kadorupadidugi.weebly.com/uploads/1/3/1/6/131636929/6900697.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451545/normal_6014467d824c7.pdfIn PDF document text
    • https://kojemugolipoxo.weebly.com/uploads/1/3/4/7/134729864/4124668.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4506131/normal_5fe5ae051bae5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427274/normal_5fda84b0be112.pdfIn PDF document text
    • https://dapalijika.weebly.com/uploads/1/3/0/7/130738969/3026158.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453908/normal_5ff6568096842.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489257/normal_5fdbcad604af4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447253/normal_6019798d67ac1.pdfIn PDF document text
    • http://jusefaw.22web.org/kaleforazuvugoj.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385028/normal_5fe4f55b1178f.pdfIn PDF document text
    • https://cdn.sqhk.co/tufuboloruj/Xjajaif/kigenijapigoveg.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454422/normal_5fe11204332d2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414176/normal_5ffea668bca85.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404520/normal_5fe615ef68cf9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000c117.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC117 5060 bytes
SHA-256: 3d492587a4f084552acd270f23b4581aa8b7caba0e65a89721d2d19a5e4fd3b4
font_01_sfnt_off0000d250.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD250 10044 bytes
SHA-256: 3cfd0f19f7c5e81eb31e37b9db1a588b84e942fbeb696e0d112e387464bdbbb8

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