Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f7047a71233d004…

MALICIOUS

PDF

65.6 KB Created: 2020-11-09 14:58:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-02-23
MD5: a0ea4c175b3b1088e98bc8c162702424 SHA-1: 2de1b419ba9afdbd2ef2234fb931edb4a0461da3 SHA-256: 6f7047a71233d00486ed84a682aa92467c9aa1b0c07e96746c44a5dd54d23053
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://trafffi.ru/aws?keyword=downtown+berkeley+ymca+holiday+hours PDF link annotation
    • https://tusezewepoxir.weebly.com/uploads/1/3/4/3/134339989/a0445b1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384649/normal_5f8cfcc3352e8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417992/normal_5fa001e45c48e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408873/normal_5f92932ed2338.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365576/normal_5f90cba9dd2a3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375503/normal_5f9806f0416c1.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/dusubonifu/st_clair_county_jail_michigan_address.pdfIn PDF document text
    • https://s3.amazonaws.com/farezelof/koledigebakuwowiredi.pdfIn PDF document text
    • https://s3.amazonaws.com/tanapilamaxi/24412531774.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a74fdacc-16d6-4634-b6ae-1a54c6896830/sirivonepurefaxivij.pdfIn PDF document text
    • https://s3.amazonaws.com/roware/76903544397.pdfIn PDF document text
    • https://s3.amazonaws.com/vezumobigodub/tepidoza.pdfIn PDF document text
    • https://s3.amazonaws.com/mizeteb/city_guide_x_personals.pdfIn PDF document text
    • https://s3.amazonaws.com/mijedusovineti/60790853773.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_off0000c02d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC02D 5576 bytes
SHA-256: 8993de526f1a82d319f270412e0dc8164a971a84f9d57219d56f951f2dae9f52
font_01_sfnt_off0000d312.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD312 11188 bytes
SHA-256: 7547b0a301d8fb744e180e9ddc9de284d321da5b2c0be8aa51a8beff3fbd51c9