Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa5ebf96ab148847…

MALICIOUS

PDF

76.0 KB Created: 2021-01-07 02:13:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-03-31
MD5: c835b709c64a88e611c47aedda2233dc SHA-1: 7f62491c256dff82ebb6a8790cc6dd0174975810 SHA-256: aa5ebf96ab148847c9134acf86d8dcbb3365577bf21c83f92b7c894ae20bb56d
136 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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/shook?utm_term=vr+horror+games+ps4+multiplayer PDF link annotation
    • https://wadozivapo.weebly.com/uploads/1/3/4/5/134512268/gabenuke-dukafina-nobatikasavo.pdfIn PDF document text
    • https://dosedupuwosiwoz.weebly.com/uploads/1/3/0/7/130776272/mamowoduvefidu.pdfIn PDF document text
    • https://ginixogigifigat.weebly.com/uploads/1/3/4/3/134367444/vedew-bavasusalo-koxepuveb-wixukazapegoru.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/zukogi/police_report_washington_state.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bb3d8eab-f072-4778-8b23-8ad560447577/22881620542.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba86890d-d9d2-4a20-b7f0-ca69f9f11671/gesuduvobebinoforurigoru.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/262eccf4-74d9-44c0-8d1f-71c20a2ac894/69287431305.pdfIn PDF document text
    • https://s3.amazonaws.com/wusigipufuvowix/nawalemepebob.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5cf13626-bfc6-43c9-bb84-ca81797a5c35/31637936256.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9a5be6bf-dbec-4245-ae2f-b5afc1364b2a/pathfinder_kingmaker_best_feats_for_wizard.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6aca8ff4-21ed-4e9e-82b3-77f83cc2c739/jipofiru.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/da546289-6b12-4fc5-841c-16146a321215/persian_war_worksheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/02dc8edc-9ed4-4579-a4df-2aa9fe1cf05d/tidunukuk.pdfIn PDF document text
    • https://s3.amazonaws.com/genedesowul/92127838184.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c4e518d4-f541-45a1-ac3b-1d7f21673398/dont_stop_me_now_sheet_music_with.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_off0000edff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDFF 5388 bytes
SHA-256: d8358bc2a03229a98c159523fe2a31bcea6de6764612d5ec276ff3fac68582cd
font_01_sfnt_off0001003d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1003D 10292 bytes
SHA-256: c7a89fd56e0d64fb17e57d144b330a31d315d50368ce8ba16e483954d31b0610

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