Malicious PDF — malware analysis report

Static analysis result for SHA-256 83f4aec5b22b4cfc…

MALICIOUS

PDF

44.4 KB Created: 2020-10-06 11:19:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-17
MD5: ddbffc26f283379df26b2ef865f355ad SHA-1: cf2d9a4ed67435b0012bd2e8cab44131a3fdfb78 SHA-256: 83f4aec5b22b4cfc62441cae3db6f223e39c07233e52c3b8513b4d3bf77dafcd
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://cctraff.ru/strik?keyword=read+theory+answers In PDF document text
    • http://wowoli.chesterfieldlimos.com/uploads/1/3/1/8/131871655/4616725.pdfIn PDF document text
    • http://jadinuguk.thecoachmensclubhouse.com/uploads/1/3/2/8/132814742/fc52b707b179a3.pdfIn PDF document text
    • http://files.highmarksmanufacturing.com/uploads/1/3/1/8/131856186/3153018.pdfIn PDF document text
    • http://files.otahnagonlodge172.org/uploads/1/3/2/7/132740584/lukuv.pdfIn PDF document text
    • http://dizulenuj.qcstriders.com/uploads/1/3/2/7/132741024/fewamewejaneb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/8606/1463/files/rebajigubemukikuda.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0488/2278/0069/files/grit_hockey_bag_junior.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0446/7264/7331/files/sowogodibewazirilagexu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/6259/4202/files/texalofizo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0499/3856/3230/files/refakiwajutiz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f5aadac6-e662-445b-9f07-259c8ea27bf4/guvodajitaja.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b82bfd8e-fc09-4d00-a342-567e26f15e1d/90080485859.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a24a6305-6d18-4cb9-8682-8d1ae6be8715/69944958184.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
🗂 Part of campaign: effinghamelementary.org 9 samples

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006f87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6F87 5080 bytes
SHA-256: 8afae57daf1b8812d1dc4311d0f61d6afcf02cbb7f6cf2f27dd5730152c626e3
font_01_sfnt_off000080e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x80E1 10812 bytes
SHA-256: 35761548ecc89020cb4bfc2120e8126bbc4389e6f33d1c7cf2e899d57e7e16ec