Malicious PDF — malware analysis report

Static analysis result for SHA-256 77f181a98726985f…

MALICIOUS

PDF

57.3 KB Created: 2020-11-05 15:56:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-19
MD5: c4c0033505256d53ccbd8fd991932a65 SHA-1: 8212ab1b8b467154361ed18e6bef3f25ee5ac9a8 SHA-256: 77f181a98726985f8a53f49d8806d318c2635687116005e8d7f055fe676c5b1a
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://trafffe.ru/aws?keyword=trek+830+antelope+for+sale PDF link annotation
    • https://pexulowiseguwuz.weebly.com/uploads/1/3/4/3/134391342/funubaw.pdfIn PDF document text
    • https://jukovuwivoxufab.weebly.com/uploads/1/3/3/9/133997180/jurupoketapepib.pdfIn PDF document text
    • https://bupifepubeweta.weebly.com/uploads/1/3/4/3/134336259/lilotopisix-fazixirukuzogu-xuzof.pdfIn PDF document text
    • https://dojudiwoju.weebly.com/uploads/1/3/1/4/131406456/wutugamatebu.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/rizezobabub/86660898167.pdfIn PDF document text
    • https://s3.amazonaws.com/tadovu/21486719333.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/009d037f-1dc3-4882-a869-1249b54f20e1/watch_one_piece_stampede_subbed_online.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0e0e31a2-02a7-4bb6-8f1b-d00aaf9b296c/44056720047.pdfIn PDF document text
    • https://s3.amazonaws.com/zidosozawok/21911955349.pdfIn PDF document text
    • https://s3.amazonaws.com/fasanag/pdf_to_dwg_online_convertor_free.pdfIn PDF document text
    • https://s3.amazonaws.com/fejififimaketo/goodnight_moon_by_margaret_wise_brown.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/59966230-bd23-4447-b525-9f4cb5fb2bba/kinitanarepukoxe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6c753c9d-0175-4b83-ac1d-5d552db0490e/4566504083.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/45f9f601-9e8a-4437-8697-3f7eb46e135a/kikibugewasilo.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_off00009fbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9FBF 5408 bytes
SHA-256: 5d378ba3f9d07d8c4db6acdcd151cc17cc88e4e9cfb1bb1eb9188999ffa6eebf
font_01_sfnt_off0000b237.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB237 11400 bytes
SHA-256: 8a4ff77dd1a33f93aacde18e1fa506c110c76ced80d88087987fcfbe5e1f6b0b