Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd4081a1f879870b…

MALICIOUS

PDF

70.9 KB Created: 2020-11-17 16:25:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-01-23
MD5: 8498efc5ba7ad848f415c8a6f756ee7d SHA-1: 152c2cdce09ecaccf9ba0b074a2646c57265f677 SHA-256: bd4081a1f879870bf3078a2805a3e2f573fe5389382945f05f1314c7f0bf51ac
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://traffine.ru/123?utm_term=enum+type+to+string+c%252B%252B In PDF document text
    • https://cdn-cms.f-static.net/uploads/4375887/normal_5f8b7d25013fa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392872/normal_5fa5960268707.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381964/normal_5f9993527a1c1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426820/normal_5fa40e87691d7.pdfIn PDF document text
    • https://lokixesope.weebly.com/uploads/1/3/1/6/131607163/xugotofopelavuduxura.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389571/normal_5fb2b0006883f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475563/normal_5fad737f145ee.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389106/normal_5f938afd1b18d.pdfIn PDF document text
    • https://netaluzubik.weebly.com/uploads/1/3/0/8/130813777/pituvik-masodos-bitoritawusa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388426/normal_5f9202624d324.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388178/normal_5fb372ef91e13.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366309/normal_5f881a8616f4f.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/fasanag/filasopezabipagu.pdfIn PDF document text
    • https://s3.amazonaws.com/bejeseja/celtic_mythology_stories.pdfIn PDF document text
    • https://s3.amazonaws.com/gifojuxaxeva/91593123964.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_off0000d0cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0CF 5068 bytes
SHA-256: 5eb83d146870d75bcd0b2ed2dbec3baa1aa14f42dc320baf4b94dc91e47fe3d4
font_01_sfnt_off0000e212.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE212 14136 bytes
SHA-256: bd8ded5ebd057c9c166a53c7b2fd901bb18cf5243b2307a517855711a0046985

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