Malicious PDF — malware analysis report

Static analysis result for SHA-256 e65d7bf0f115cce3…

MALICIOUS

PDF

41.4 KB Created: 2020-11-02 10:39:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-12-26
MD5: 30360d0943ed10ed7fc822d40f11dc1d SHA-1: 6fdfc0a16633fdd0cc71dbcb175271c9de16897e SHA-256: e65d7bf0f115cce3f133b1d44d9f365a9cd11349fbdb2e92acf7223532502ccf
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/aws?keyword=webb+city+high+school+principal In PDF document text
    • https://fuwurugosudopo.weebly.com/uploads/1/3/4/3/134326966/9679511.pdfIn PDF document text
    • https://jawasolasazilem.weebly.com/uploads/1/3/1/3/131379174/3722212.pdfIn PDF document text
    • http://www.ascendercorp.com/In extracted file (font_00_sfnt_off00006497.bin)
    • http://www.ascendercorp.com/typedesigners.htmlIn extracted file (font_00_sfnt_off00006497.bin)
    • https://uploads.strikinglycdn.com/files/8d2fed47-a1f6-444c-b6dc-2ef820c398dc/79783328852.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7df337e6-2a23-4cb5-8fd1-d169f720ca1b/16163490886.pdfIn PDF document text
    • https://s3.amazonaws.com/ropuba/25808910987.pdfIn PDF document text
    • https://s3.amazonaws.com/zirojopemup/99242411364.pdfIn PDF document text
    • https://s3.amazonaws.com/zuxadol/48718967538.pdfIn PDF document text
    • https://s3.amazonaws.com/robumuduluwise/kadambari_in_marathi_free_download.pdfIn PDF document text
    • https://s3.amazonaws.com/wilugugo/90585453254.pdfIn PDF document text
    • https://s3.amazonaws.com/jewizopukuni/affidavit_of_next_of_kin_form_alabama.pdfIn PDF document text
    • https://s3.amazonaws.com/legenapi/foster_parent_insurance.pdfIn PDF document text
    • https://s3.amazonaws.com/xetasif/55259025937.pdfIn PDF document text
    • https://s3.amazonaws.com/sikuva/papyrus_of_ani_download.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 extracted file (font_00_sfnt_off00006497.bin)

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006497.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6497 5452 bytes
SHA-256: 7bea6d7ebf88f68f023a468e70c9be05ea50de8cc85efd6ea37f0fd0edc3e949
font_01_sfnt_off0000772e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x772E 9852 bytes
SHA-256: cdec4fc76ad1041221f2681b435d3a6ae5aaf08c45a8f7eba98f6c234ed92526