Malicious PDF — malware analysis report

Static analysis result for SHA-256 23f5c9b5504bbe75…

MALICIOUS

PDF

73.6 KB Created: 2021-03-04 00:34:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-04
MD5: 27b405b57459feeea6ffd779d8cb37db SHA-1: 1220bf4babe7913db2770e538b6dd969094909f3 SHA-256: 23f5c9b5504bbe75bdbd45e3b102c14dd8c94fd9d860acddf338a0aef43b04d7
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://golowaki.ru/123?utm_term=how+to+download+visual+basic+application PDF link annotation
    • https://cdn.sqhk.co/tajiwikiter/gchjiaU/remote_control_drone_helicopter_video.pdfIn PDF document text
    • http://bossyonlinex.com/now_were_stressed_out_lyricss3thq.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393019/normal_5ff13a82cdfdc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4472773/normal_5ff8b235d0306.pdfIn PDF document text
    • https://wibujiwegawej.weebly.com/uploads/1/3/4/8/134899761/fcb0c610.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416792/normal_5fefabdc4a82c.pdfIn PDF document text
    • http://my-favshopc.online/xenofesufixutizirh28n9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365652/normal_602bea5200365.pdfIn PDF document text
    • https://cdn.sqhk.co/tedubifo/iihdgdo/star_traders_frontiers_ios_review.pdfIn PDF document text
    • https://fojomuku.weebly.com/uploads/1/3/4/4/134447263/vamun-rakoximorad-bupiwewavotolik.pdfIn PDF document text
    • http://ita-women.space/biblia_de_estudio_thompson_en_linea_gratis1oobh.pdfIn PDF document text
    • http://creamspait.xyz/dopapijofixo2wx.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450039/normal_5ffc336f53fef.pdfIn PDF document text
    • https://zapirugitoz.weebly.com/uploads/1/3/4/5/134508168/basovage_girufedof_vofurid.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jokosen.atwebpages.com/iso_22000_2019.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_off0000e2e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2E7 5224 bytes
SHA-256: 4d84a083d2cee37a6134b62254490314dfff39486586635e3e99bd29aca8e26d
font_01_sfnt_off0000f4d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4D1 10696 bytes
SHA-256: 18fd1f658fe127d6755b421f908056a781d77c89d2ddbe156a05fdde318dd2cf