Malicious PDF — malware analysis report

Static analysis result for SHA-256 abc67f67f548e1ec…

MALICIOUS

PDF

42.5 KB Created: 2020-11-09 12:57:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-02-23
MD5: 3e761423751bfc686c8b157e7228136c SHA-1: 75a8c945c283a1e2201f60a67f0309358d69817d SHA-256: abc67f67f548e1ec05686dc5910e97c5569d1dfd25a57d3c982d01573604a60c
136 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://trafffi.ru/aws?keyword=1977+chevy+light+duty+truck+owners+manual+pdf PDF link annotation
    • https://sujajikozodes.weebly.com/uploads/1/3/1/3/131384638/944560.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392237/normal_5f92c0e0b6793.pdfIn PDF document text
    • https://melegejisud.weebly.com/uploads/1/3/1/3/131379421/levijuxomemal.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389616/normal_5f9ec46381290.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/goporo/51066780114.pdfIn PDF document text
    • https://s3.amazonaws.com/tadovu/ufcu_routing_number_utah.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/da71dc48-7056-40ff-b126-00f033e9f37e/dewejaderezadosibur.pdfIn PDF document text
    • https://s3.amazonaws.com/novifamigot/beginner_pickleball_lessons_near_me.pdfIn PDF document text
    • https://s3.amazonaws.com/tanikanaw/pazukerukekolafujop.pdfIn PDF document text
    • https://s3.amazonaws.com/memul/10_thirumana_porutham_meaning_in_tamil.pdfIn PDF document text
    • https://s3.amazonaws.com/fejenijovekozu/zodera.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7f49d3ad-2051-4104-a431-3e4f1ce18f13/46013710769.pdfIn PDF document text
    • https://s3.amazonaws.com/naramuro/fobamonarililepafezogome.pdfIn PDF document text
    • https://s3.amazonaws.com/lurutopobi/circulation_diagram_architecture.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_off0000664e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x664E 6080 bytes
SHA-256: 5b0f6b0225c0d43857edc9a255a75c2be877b7bfc6325b0d7178759437e39614
font_01_sfnt_off00007afe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7AFE 9876 bytes
SHA-256: 28b5c9dae3b5eca6459fbbb048f64abb12fa03a2cf2186010809ed776971a388