Malicious PDF — malware analysis report

Static analysis result for SHA-256 c24d8370290c8b71…

MALICIOUS

PDF

42.2 KB Created: 2020-10-04 04:05:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-19
MD5: 5f85f0be64f7e20b57b12af351b2670f SHA-1: 5753aaa8a40675618059af7b327863c19a73692a SHA-256: c24d8370290c8b71467178936e9fd9e9ebb524e1bbff197f7da7f219ed8ccfb7
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=inicia%25C3%25A7%25C3%25A3o+ao+espiritismo+pdf In PDF document text
    • http://files.jacynthenolet.com/uploads/1/3/0/8/130813639/502968.pdfIn PDF document text
    • http://tulipu.clubhispanodelakeland.com/uploads/1/3/0/8/130814328/1883860.pdfIn PDF document text
    • http://vewabo.jamiekadas.com/uploads/1/3/2/8/132814930/wezilazelan_besejatakegobum_dizez.pdfIn PDF document text
    • http://supazaf.susannsuprenant.com/uploads/1/3/1/4/131453808/c7cad4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/c1609a8e-9192-4c66-8d0e-e11fe8a43472/fujogoxumowuwenonejetator.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/411f7426-09b3-413f-99a9-71f6e6d73785/biduven.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9ed72098-7e61-4143-a073-3e0060acfeed/34259589688.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/2343/2861/files/rational_functions_graphs_worksheet.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/9105/7058/files/kujem.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0479/5085/6348/files/game_meadow_2.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000056a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x56A1 5496 bytes
SHA-256: 0837ca28b772ce6bbb6b2a8d79709b18bb2ef79e30c1de02ec184c3fc4846775
font_01_sfnt_off00006847.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6847 11712 bytes
SHA-256: 772163d8d79133478334b4948b1c263b8de85eeee3acc13fe23516cb262ccb8e
font_02_sfnt_off00008c60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8C60 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333