Malicious PDF — malware analysis report

Static analysis result for SHA-256 c99f6fa963c1508f…

MALICIOUS

PDF

72.5 KB Created: 2021-02-17 23:44:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-10
MD5: 3ad9c08a22b11fa727851563ac6ea19a SHA-1: a3dc7aa9515c2da160c030217fe93cc18f6a3dd2 SHA-256: c99f6fa963c1508f5a3bfb584cc631f49a425eb23bbfff198e1913d613eb79e1
196 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://maypoin.ru/wix?keyword=teacup+yorkies+for+sale+in+oregon PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4384652/normal_601ad27195a82.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367914/normal_60299dec403da.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454999/normal_602535da7a39c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465687/normal_5ff08176b4771.pdfIn PDF document text
    • http://cupe1.ru/vimanas_and_the_wars_of_the_gods7a8f0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368964/normal_5feefb058341f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4406464/normal_6002b4bf7c733.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408188/normal_601dbc703f579.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470696/normal_6010cf1cd6337.pdfIn PDF document text
    • http://rusakova.space/fisufozegakoxqgg01.pdfIn PDF document text
    • http://idealica-italiaufficiale.website/cambridge_english_first_2_with_answeoej8s.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368750/normal_6016448adec32.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456666/normal_601add514d456.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404755/normal_600f7bd6d5fd8.pdfIn PDF document text
    • https://zapeledi.weebly.com/uploads/1/3/5/3/135314532/juwope.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000dcda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCDA 5300 bytes
SHA-256: 625eab980c034093370a1b9931b3b4d8904e5717f017ab5f3369ebcdf4a688c3
font_01_sfnt_off0000ef00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF00 11048 bytes
SHA-256: 336f777f551c879144fc561a312c1eff736df95c2fb3b9cf4521317707a3ef5b