Malicious PDF — malware analysis report

Static analysis result for SHA-256 b46b5d39d577a862…

MALICIOUS

PDF

138.4 KB Created: 2021-02-23 06:38:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 12b07ca2ca7decb10d8357403ade77f3 SHA-1: ac40dd9c32757e2229df1903bf3b44f05700bd79 SHA-256: b46b5d39d577a86250259cfd9167d5a8d1eb7f424115d0fb9d5a459ad5512532
254 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains multiple heuristics indicating malicious redirection and a link farm, specifically pointing to a lure for 'Sword art online episode 92'. The primary malicious URL identified is https://crophysi.ru/wix?keyword=sword+art+online+episode+92, which is used in conjunction with numerous other PDF links to create an SEO link farm. This suggests a phishing or scam attempt designed to drive traffic to malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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/wix?keyword=sword+art+online+episode+92 In PDF document text
    • https://cdn-cms.f-static.net/uploads/4413469/normal_6026dc097d7a0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444864/normal_5fd05f0db54aa.pdfIn PDF document text
    • https://likuwamagu.weebly.com/uploads/1/3/4/8/134899286/ffa2e635ade1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386594/normal_5fc7582027af0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4463538/normal_5fcaa39c5073b.pdfIn PDF document text
    • http://bbflowers.net/satezihqt9y.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487622/normal_601658d726da9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382423/normal_5fdd44da5d79f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375885/normal_602f4119a7e6c.pdfIn PDF document text
    • https://wudizabilizone.weebly.com/uploads/1/3/4/7/134745746/nezava-mivogupu-podugager-bibaro.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4474739/normal_5fde13acf27bb.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/mixanaz/delogevubin.pdfIn PDF document text
    • http://nikavavufuxirel.epizy.com/76098837178.pdfIn PDF document text
    • https://s3.amazonaws.com/vabemavuputenif/automation_studio_5._2_64_bit.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
stream_003_off00012ede.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x12EDE 55468 bytes
SHA-256: 68011dba76530c2ec85c77051918268d418af07f7ad3d79998bfa78810ed4b02
font_01_sfnt_off0001d63d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D63D 5436 bytes
SHA-256: 4f464117ce2623be35d5cc05c2714ddf9c54cff20ab626bf1a248be0cbf18397
font_02_sfnt_off0001e8d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E8D0 17156 bytes
SHA-256: 179a2e89758d28750c8fed5b19b382e31a306854e9a29b36f8e2c438cb4cf2cc

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