Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5903f11478cc797…

MALICIOUS

PDF

66.3 KB Created: 2021-01-24 11:25:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-25
MD5: f409a54c723891fb9daa62b0e90f1ea1 SHA-1: 28510e94d4dfb0c0c0ccb257c70fd159a193b48a SHA-256: c5903f11478cc797b7aa7bddce47fed55830b7d5b5896b5df487dbb76c5fc6ce
216 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://baarspo.ru/wb?keyword=mobile%20passport%20app%20airports PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4455198/normal_5fc5b60a4658c.pdfIn PDF document text
    • http://pitushok.space/jasexftt42.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365662/normal_5fedc4ddf0c86.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4499002/normal_5fe0b5fed2d1f.pdfIn PDF document text
    • https://cdn.sqhk.co/poxufape/gyCjhn1/xezelitapejusadujojo.pdfIn PDF document text
    • https://mogatuzutixu.weebly.com/uploads/1/3/4/6/134684840/9cbe9.pdfIn PDF document text
    • https://xuredetinumimo.weebly.com/uploads/1/3/4/6/134630251/9950810.pdfIn PDF document text
    • http://unityfree.xyz/lose_belly_fat_in_a_week_exercisepl65r.pdfIn PDF document text
    • https://lofefogurabu.weebly.com/uploads/1/3/1/1/131164054/kepizelupufodewuwu.pdfIn PDF document text
    • http://austritkfa.com/833879249213qptr.pdfIn PDF document text
    • https://povurumupun.weebly.com/uploads/1/3/4/8/134884194/2038741.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375210/normal_5feee97c1f015.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/gixawetopoli/traffic_report_m5_southbound_bristol.pdfIn PDF document text
    • https://s3.amazonaws.com/zebarufuridorur/xagemeteserumofavomu.pdfIn PDF document text
    • https://s3.amazonaws.com/folexapurilowe/52286912914.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_off0000c88c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC88C 4960 bytes
SHA-256: 53127848fedc2451994b3ad1f8513b280100b051da7e2b1de8f661bd21171638
font_01_sfnt_off0000d97a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD97A 10348 bytes
SHA-256: 8a33b295959f2afc11b69bde4e13d0f7c5feabc5e8730b9db6e6aa6c4253fca4

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