Malicious PDF — malware analysis report

Static analysis result for SHA-256 33613dfd364f3850…

MALICIOUS

PDF

48.2 KB Created: 2020-09-30 08:07:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: 160ab6f32ed09640de381d5d2a25caca SHA-1: 7e88ba630263cc6f63b682c6f271a108af801309 SHA-256: 33613dfd364f385040377bad9e7cc00f09f50a4e9151f749a572ba7427f4c37c
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://ggtraff.ru/strik?keyword=anne+ancelin+sch%25C3%25BCtzenberger+libros+pdf In PDF document text
    • http://kozawanat.whitecloudvet.com/uploads/1/3/2/3/132302921/paxebab.pdfIn PDF document text
    • http://nuwepu.smart-lofts.com/uploads/1/3/0/7/130740199/donejeligumuv_jelelixem.pdfIn PDF document text
    • http://files.shineondyez.com/uploads/1/3/0/9/130968962/2615004.pdfIn PDF document text
    • http://bozewafov.rosemontbc.net/uploads/1/3/0/7/130776031/vemotesexipufijavij.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/88424199-341f-4543-9c11-f4861e31cce4/49822777897.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8f4045e4-d6c4-4a4a-ab0a-4bc399fd3e9c/56993261792.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9fb5de66-512b-4534-98e2-f0d5ed22ad6b/felofevuwebifasike.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3159bff1-a68f-4292-93a6-c6ed127ae1bd/notituzokebosoxofeb.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/2214/8003/files/pakakedudijifilujijikur.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0450/5151/0936/files/barfi_full_movie_with_english_subtitles.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/2644/7525/files/26252889868.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/7087/1970/files/13_inch_laptop_sleeve_leather.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006145.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6145 5716 bytes
SHA-256: 12641bbaddff1ec9306b155ff0e381fa9e1034266e3003b5135d44fac0b3ebab
font_01_sfnt_off00007479.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7479 12344 bytes
SHA-256: fa7a95ac0ba9d953a1d75fd554085458bb46311ab5213d19b901ff4f59f36240
font_02_sfnt_off00009bf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9BF3 16312 bytes
SHA-256: 531e37f64a2e7dc3bfb257675d9e6c644c7b1597f33ba9a969cd005a7ed65660

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