Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b3b62323744d42c…

MALICIOUS

PDF

44.8 KB Created: 2020-10-07 18:41:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: 0a41340ef004901f4abfe9768e0677ff SHA-1: e00b169b57bf79e143c64aa67abe67ff7d2542b4 SHA-256: 7b3b62323744d42c622c32f0eca8cb94e955984bd2713cbb0e087d4a001256f8
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://gettraff.ru/strik?keyword=histograma+ejercicios+resueltos+pdf In PDF document text
    • http://files.themoveablechurch.org/uploads/1/3/0/8/130874128/9175303.pdfIn PDF document text
    • http://files.newjerusalemhbc.com/uploads/1/3/1/4/131453565/b190b5cc97dee27.pdfIn PDF document text
    • http://files.tothepointe.net/uploads/1/3/1/1/131164130/zumir.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/9922c2e9-dc76-461b-8626-29173e844180/maloxugawuxajo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a0b92625-a5e6-4670-ab4c-6dc6185beeae/7995824198.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e2387a54-3c3a-48c4-a3f5-79993cacbc3c/razovuboza.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2af09977-7cfb-45dd-b199-05aa2dfd825d/60768684402.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/3680/5782/files/deruxipeder.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/6499/7526/files/square_d_pressure_switch_catalog.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0266/8924/1258/files/clyattville_elementary_school_phone_number.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/50cb0374-cb8c-4604-aed5-7cf7fd3f3fef/kepasawelixivisolukob.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/710b4f22-1062-4be4-9605-9fe2f3614232/vizamafaxabodowavupen.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/633176a9-b700-4353-8ad5-98a24f92c6c6/fusitef.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/29ec501e-3750-4c1d-bda5-e0574c0599df/juwajexedapuxapu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a9f21425-7726-477c-b424-f32f9c3f2ebb/vugozuputevixoroget.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_off0000671a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x671A 5512 bytes
SHA-256: 9061220052d830a79af4b3a69e0b8186d9a0068ac261ff861ec763c498186d99
font_01_sfnt_off000079c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x79C7 14712 bytes
SHA-256: d2a40400abfaa4ec13eac681bf59628073efc0898bf92fad7d095e4ccf37e5e9

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