Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0f14050a12f59d3…

MALICIOUS

PDF

73.3 KB Created: 2021-02-15 07:01:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-25
MD5: 88b16ce5a200781a3f68aed0ceb02db4 SHA-1: bda468c4102006ed0158f27be5bd0d4428d81074 SHA-256: f0f14050a12f59d37245e3547c4405548f04eb4c607b5ad8efd5097bfee54408
254 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://crophysi.ru/123?utm_term=biographical+sketch+example+for+students+of+class+7 In PDF document text
    • https://nizerekudoni.weebly.com/uploads/1/3/5/3/135383630/dibezinepabijeja.pdfIn PDF document text
    • https://jozufibajas.weebly.com/uploads/1/3/0/9/130969385/3343986.pdfIn PDF document text
    • https://cdn.sqhk.co/gitaligido/ghkcjey/adults_coloring_books_color_landscape_pictures.pdfIn PDF document text
    • https://kuzogirig.weebly.com/uploads/1/3/4/7/134748708/jepuridifakomut.pdfIn PDF document text
    • https://vopoxeja.weebly.com/uploads/1/3/5/3/135346001/4306860.pdfIn PDF document text
    • http://biomaniks.website/valivilixeg3pms4.pdfIn PDF document text
    • https://cdn.sqhk.co/wejideduv/sU5id9b/nintendo_switch_app_update.pdfIn PDF document text
    • http://sanatoriy-izumrudny.ru/antivirus_adware_androidmch5v.pdfIn PDF document text
    • https://kawifapexevudo.weebly.com/uploads/1/3/4/7/134711131/41039d48bff.pdfIn PDF document text
    • https://pinobuni.weebly.com/uploads/1/3/0/9/130969003/8e7b16.pdfIn PDF document text
    • https://rivezotuxo.weebly.com/uploads/1/3/5/3/135337491/2799179.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/ropuba/11042376422.pdfIn PDF document text
    • https://s3.amazonaws.com/kaxukok/51690845927.pdfIn PDF document text
    • https://s3.amazonaws.com/nufidibodudulad/bajitabolidipuluf.pdfIn PDF document text
    • https://s3.amazonaws.com/retobifulipo/58038959215.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_off0000e13d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE13D 5832 bytes
SHA-256: 652e03dcc25062af96af1a4f94275cac18e404304d22a1fb27246804eb22ed7f
font_01_sfnt_off0000f4fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4FD 10328 bytes
SHA-256: 606f500077ca01306d76b06526467e9375948d7aaa3d60bd336df7a5534d4aef

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