Malicious PDF — malware analysis report

Static analysis result for SHA-256 0158c360efa1077f…

MALICIOUS

PDF

40.6 KB Created: 2020-11-06 01:46:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-02-23
MD5: c40ea133f2e3a10db78e02d34c5a4c2e SHA-1: e8e4dd135947c8ec61bcab9e79eecc850963b6be SHA-256: 0158c360efa1077f622b8e831994dd5e72d453bedbb4a6c74968d0b238a509d9
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://traffking.ru/123?keyword=examples+of+teacher+retirement+letters In PDF document text
    • https://nukewixe.weebly.com/uploads/1/3/4/3/134385223/8647483.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366305/normal_5f919c67ec595.pdfIn PDF document text
    • https://xilorufanil.weebly.com/uploads/1/3/0/7/130739938/8926316.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405687/normal_5f9b0c5beeac5.pdfIn PDF document text
    • https://jurizimobijagi.weebly.com/uploads/1/3/0/8/130874317/5250091.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/8417a963-df08-4e28-9b56-240ebe1b5069/927421062.pdfIn PDF document text
    • https://s3.amazonaws.com/xanebavifamopez/nanapefisepisozi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/60c1bc2a-6c89-4386-92f7-c5804aca4d33/ray_in_geometry_meaning.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9dfd9d83-67e1-4b20-8f82-fbba5cc34057/describe_mollusks_body_plan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/add6d4d7-fede-4ff1-99f0-ddb35f47e8c9/dezafarezixuluwused.pdfIn PDF document text
    • https://s3.amazonaws.com/jamokaroxoj/lerubeliwoxidel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/69567356-ca56-472b-b7eb-17e4d8eb21db/the_secret_life_of_bees_study_guide.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_off000060a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x60A3 5280 bytes
SHA-256: 812a532d38f5c833c1f8d0c778a460bff9b8defc8fca1e3d223994bc833edaec
font_01_sfnt_off00007274.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7274 10184 bytes
SHA-256: 2b7f293e0e470b58727aff159ca87fc0333a285684e6f12928b77d9efb030bdf