Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf5476ad6db9d2ca…

MALICIOUS

PDF

72.8 KB Created: 2021-03-25 04:36:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: bbe841b96298ddfee45b98019d722082 SHA-1: 4ecd460c2a0e7ae3e9c61740b4ffafc9664f4b74 SHA-256: cf5476ad6db9d2ca54d02ec0f2c7a6cc8ef380a6da0c3f1cd6ba75355ced86bc
196 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a lure related to a popular movie title, directing users to a suspicious URL (vilenefex.ru) which acts as an SEO redirector. This URL is likely part of a phishing or malware distribution scheme. The presence of numerous external links, including a link farm, further suggests malicious intent, potentially for SEO poisoning or driving traffic to malicious sites.

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
  • 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.
  • 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://vilenefex.ru/strik?utm_term=the+secret+by+rhonda+byrne+full+movie+hindi PDF link annotation
    • https://dekomowunine.weebly.com/uploads/1/3/4/6/134638227/24f2c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494669/normal_603e3d768545b.pdfIn PDF document text
    • https://renudufodajofi.weebly.com/uploads/1/3/4/8/134884992/puwime_wodari_fipakame_jijokogujaxewuj.pdfIn PDF document text
    • https://vomodubezu.weebly.com/uploads/1/3/5/3/135398809/vibiduritanu-bexelatiburasew.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379736/normal_6011b60633b19.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376105/normal_5fdec4d524e9d.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/jimugivos/zuvedofurike.pdfIn PDF document text
    • https://aefbb2f1-1cfc-4a48-aab2-d72547d84173.filesusr.com/ugd/2f3ac6_c31e69808895412a90192c8c0b2edeb1.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tokatefozude/chinese_dragon_pictures_to.pdfIn PDF document text
    • https://7e574f8b-ef34-4833-8dee-b18f3ac9fc91.filesusr.com/ugd/af8ffd_c95c9ed946a248eea917616d493dfe1c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tutapaxi/btc_ka_full_form_kya_hota_hai.pdfIn PDF document text
    • https://dc5ca969-d333-4582-9879-b719aca70d73.filesusr.com/ugd/760c43_57cee4d60bad45e0a584e39699adf52f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b064ea19-9278-4bb7-9649-17a67306f903/somoxagojumuganivuve.pdfIn PDF document text
    • https://2e4d99de-9d37-4ce2-abd5-0bbccafdbe51.filesusr.com/ugd/33a2e4_421cfd60ef3b47b294633c58038cff4d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sebunuzu/dokuzonodemakimuka.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aad5780d-51f0-44b6-982a-726ee3a90989/torirobemoronerimugaxuf.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_off0000d22e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD22E 5512 bytes
SHA-256: aef1d8963e64fbcc84dcab4d6b5b833b63ff1750f9533b43cc135613907b9e50
font_01_sfnt_off0000e4cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4CC 1860 bytes
SHA-256: 8abe30b9993ee33bfcd45ad2c12551479fe7237befddd135ea8f17f22e823938
font_02_sfnt_off0000edc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDC6 11348 bytes
SHA-256: 8114ee2497377e3be5fb60b7ee2d7f17e21065dcecf3dd22d61f5e5c1bff0a9c

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