Malicious PDF — malware analysis report

Static analysis result for SHA-256 7647096b920fbdc1…

MALICIOUS

PDF

36.8 KB Created: 2020-10-07 08:18:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-04
MD5: 3ee37c3c4b320a5da8feca5af7d07b02 SHA-1: 4bb9b372c5a47dbeea43c1e6df47031989b886d3 SHA-256: 7647096b920fbdc199ec833d9c4651f7c1a6414347635f120ad8fd58b78296e8
194 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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?keyword=hybridization+of+pf5 In PDF document text
    • http://zununafew.myweeklygrind.com/uploads/1/3/2/6/132682787/536536.pdfIn PDF document text
    • http://files.skagitcohousing.org/uploads/1/3/1/4/131407089/e3da2f50f.pdfIn PDF document text
    • http://bozokakix.bikeshopgillette.com/uploads/1/3/0/7/130775354/semilatoxurid.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/4fd4e61c-e8be-4d5b-ab6d-66af0489ea45/lamox.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d6646d8a-26c9-4924-aa72-860fdfa4922e/11965865300.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0f921323-8a01-472e-a0b1-3d086db6d0b4/34260711996.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f0d74af1-50e9-4269-b013-6d877f7772af/ridujulaxowebanibixawu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4904f383-752a-4961-a5ca-d719993bea1b/57365768894.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5b0eab57-7390-4007-8994-686bd3129091/33295454002.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0bab45d6-96dd-448f-86e0-68f97d8bdc10/50203005414.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e08a9b03-1ec6-4857-a3bf-29ad2a378501/23435275269.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7df6da36-f212-415c-bd60-de8dd0ad2768/88677881517.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/6129/4757/files/87579663810.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/0574/7095/files/grammar_workbook_grammar_grades_7_8.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/8418/4728/files/sowelifanokanojozib.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0266/8222/8907/files/peremidari.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_off00005219.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5219 5200 bytes
SHA-256: 4934de5634e40b1efeb6c8697904b6c130c1fdc516d8f54bc80cd884d8a6a993
font_01_sfnt_off000063eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x63EB 10176 bytes
SHA-256: 3b62abfd8ae6b27c26340633c0ffe94974c96f9a7bc6227a607e4b414d0317f7

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