Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5f5f4d4f678886d…

MALICIOUS

PDF

61.0 KB Created: 2020-10-10 13:09:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: 2c56db933877395dc9bc5c7cd0df70f3 SHA-1: 7058817dfab2f6d224f0a19352ded1c5cb8f07d3 SHA-256: d5f5f4d4f678886d9e4e0dc09e3033fd0e047406a44458b70e39ecc95c358e53
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=concordancia+verbal+e+nominal+exerci In PDF document text
    • http://mavazu.mountaineerauctions.com/uploads/1/3/1/3/131382028/a736e6af.pdfIn PDF document text
    • http://files.hollymoxley.com/uploads/1/3/1/4/131436956/veganezufuvosogabu.pdfIn PDF document text
    • http://juzavovu.habamania.com/uploads/1/3/1/1/131164250/nofesoge-fimaxekuzi-kebel.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/c570af3c-b02f-4c78-b5a0-938fee2b27db/49291056525.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1258b7cf-aef8-4c1e-acad-cbc9d1ff4400/46883227996.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/28ab09c7-7a47-4a71-beeb-3cc3abce0b74/95992914199.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0501/1682/1157/files/17906128981.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0488/3398/6725/files/formal_letter_writing_rules.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/0172/4580/files/xezukotufedosimapu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/4474/7929/files/lego_remote_control_cargo_train.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/4299/5352/files/subject_verb_agreement_exercises_advanced.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1f2a33fb-627b-4419-a8b1-c89908ef9451/95093298998.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8037ed75-6d24-4e21-aff1-12a976a2de26/kusasajepilewewixuwepogi.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_off0000b1e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1E8 5080 bytes
SHA-256: 53282783752a99a095e6aa341d6227c9b99f31c0d76add66d417cb3f2afa6e1d
font_01_sfnt_off0000c31c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC31C 10588 bytes
SHA-256: e81e289053bfbc0abe74d56f13d99514eb17b671571b911250a8a8dfa7ce45f5

Open this report in the interactive analyzer, or submit your own file for analysis.