Malicious PDF — malware analysis report

Static analysis result for SHA-256 665c618b63bd3d67…

MALICIOUS

PDF

78.5 KB Created: 2021-01-01 16:43:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 28f459c873d08bf7e80e6817441dbafc SHA-1: 95f67a6faa0d38a84ba5b6437e9523741bb68d66 SHA-256: 665c618b63bd3d6765f410faf726ac7f7e08aa2602968bba10e415a36422026a
254 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link T1059.007 JavaScript

This PDF file contains multiple embedded links designed to redirect users to malicious websites, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK and PDF_SEO_LINK_FARM heuristics. The ML classifier also strongly flagged this sample as malicious. The primary malicious URLs identified are cctraff.ru and voxonevixes.weebly.com, which are likely used to host phishing content or distribute further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://cctraff.ru/strik?utm_term=6ix9ine+runner+all+songs In PDF document text
    • https://voxonevixes.weebly.com/uploads/1/3/4/3/134383310/zematowuwe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409000/normal_5fcc28e7e9d68.pdfIn PDF document text
    • https://runumoviw.weebly.com/uploads/1/3/4/8/134854062/9729842.pdfIn PDF document text
    • https://newusopuwizan.weebly.com/uploads/1/3/4/7/134713970/3232989.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379049/normal_5f9f5700b75fd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372740/normal_5f9e0f8919800.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409110/normal_5fbc2510329dc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369333/normal_5fa3ad40d69b2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/008fcfc1-1dc0-4437-bd5e-588ce581ff09/barthes_mythologies.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ff8ba45a-d54d-452f-8166-8cec358b27c2/fibijapadog.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aa1903a6-0a29-43bd-940b-25aade6d56b1/nexus_mod_manager_w3c_xml_schema_nmm.pdfIn PDF document text
    • https://s3.amazonaws.com/vunizi/system_bass_music.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

Related samples 4

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f71f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF71F 5136 bytes
SHA-256: 8cfb106e6f0598e36878b555a55a87f5b611ee37eb95e97420eb39e31926f230
font_01_sfnt_off000108a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108A1 10756 bytes
SHA-256: ee86cba01f653813203ff79614584c3652ee90aa34ac8dd76f55eada3cb04e8b

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