Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a39396955226317…

MALICIOUS

PDF

58.6 KB Created: 2020-11-07 06:18:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-01-11
MD5: 5370aaca54c6cc11f898f48f4634eec5 SHA-1: c71f58e0598f5babaacf8135e671cd10f0000f3a SHA-256: 4a39396955226317089004afd238e4853420abeb6464747d3e482eb3dfb42897
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://traffset.ru/aws?keyword=the+backyardigans+tasha+dance PDF link annotation
    • https://xaxaguxoludu.weebly.com/uploads/1/3/4/5/134519627/rebesorerifiganej.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369486/normal_5f87f06d5f4f9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369916/normal_5f8a16aec13ee.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/2be65505-61d9-4b7a-95c6-1dbea6220a1b/lodinek.pdfIn PDF document text
    • https://zipexazoti.files.wordpress.com/2020/11/vekomozewegebanerilim.pdfIn PDF document text
    • https://temobozuz.files.wordpress.com/2020/11/fulojekejuwodezikixi.pdfIn PDF document text
    • https://pozaxatugifu.files.wordpress.com/2020/11/centrifugation_nptel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/53696820-4a94-4270-b4d8-960669968803/the_birth_of_capitalism_a_21st_century_perspective.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/978bdfa9-813d-4aa7-8812-6c7af7f1e656/47889280536.pdfIn PDF document text
    • https://vipidagus.files.wordpress.com/2020/11/34078578093.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_off0000a5bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA5BB 5424 bytes
SHA-256: d776eafa628c50e7b28a66e94260b6add61f2191e0ee2c1910d16d64b1cc3c5d
font_01_sfnt_off0000b82e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB82E 11224 bytes
SHA-256: 79bd1d6270e0520b67a91a2e5a5c4713667955cb9be79355128a392d2db554f0