Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ece0de0e94f3f85…

MALICIOUS

PDF

72.0 KB Created: 2021-01-07 11:16:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 2cb7ac8f514d13b1a21763e59a14a9ea SHA-1: e516554a19fbf773be69587e0bddbb3587e9803c SHA-256: 6ece0de0e94f3f851e27b799ce37fb4d7ef79267c6167342d1a424fb989999b6
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, including a critical finding for a malicious redirector. The embedded URLs point to known malicious infrastructure, suggesting the document is designed to phish users or deliver further malware. The ML classifier and ClamAV detection strongly support the malicious verdict.

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/123?utm_term=ibm+db2+sql+codes+pdf In PDF document text
    • https://rivatekat.weebly.com/uploads/1/3/4/6/134626126/121f871b874.pdfIn PDF document text
    • https://dukitupa.weebly.com/uploads/1/3/4/3/134393571/novasototo-mazajamojuj.pdfIn PDF document text
    • https://cdn.sqhk.co/paparidew/javnMxi/counting_coins_piggy_bank_game.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450041/normal_5ff027459c332.pdfIn PDF document text
    • https://dezitatukuti.weebly.com/uploads/1/3/5/3/135389988/707619.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/42f4543a-d1ae-423d-be05-273cf4eb20d8/the_crucible_quotes_john_proctor.pdfIn PDF document text
    • https://s3.amazonaws.com/satudifin/slayer_guide_osrs_2018.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0787436a-b095-48ee-a642-9b0e8900e021/memiwebakesejazalazebexu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/22d95849-ace3-419c-8a1d-a44ba54f5121/82266953647.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a05e6ad4-f62b-4e77-ab86-818da44d51f2/9931498160.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/345b6a61-cc69-451c-8d02-072914bd258e/jisiruvafibutuxoxulikenor.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_off0000dd84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD84 5332 bytes
SHA-256: 887dc71cd1752b416afa18df17c1a0b5cb4433d90b7e6941d2da7a8d91ebf300
font_01_sfnt_off0000ef94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF94 10656 bytes
SHA-256: d25ff782984d5a8544717ee5aec0418b70c43bfefe9d96ade95b86a0ba3eb7a1

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