Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8d74a602ba5938e…

MALICIOUS

PDF

69.0 KB Created: 2021-02-25 03:01:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-25
MD5: 6b563b4758e7a96538b33bc31a845a62 SHA-1: c34e0d674dcf1676888a81f3feb26ccf2ef2005a SHA-256: c8d74a602ba5938e381129c766c3bad479bfe5bf7457c446d980767a9fe8df09
254 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://yafferge.ru/wix?keyword=atom+worksheet+answer+key In PDF document text
    • https://zelasiboromur.weebly.com/uploads/1/3/1/6/131606405/wusukegafapi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407301/normal_602d96d8e162b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496577/normal_5fe7ee7b31cff.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420934/normal_602f948938523.pdfIn PDF document text
    • https://pazijovipa.weebly.com/uploads/1/3/4/3/134327002/a06bb7d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414159/normal_5fd7ec3519582.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369630/normal_6029523596a20.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4505820/normal_5ff0d52c5f557.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496816/normal_602daa97642f6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450907/normal_6002dc7c80a1e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470228/normal_5fdcb6619416c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374853/normal_5fcb2883353fa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452382/normal_5ff0647add9a1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pagosunizuboroz.epizy.com/85216280233.pdfIn PDF document text
    • https://s3.amazonaws.com/dowavelaxam/difference_between_antigen_and_antibody_yahoo_answers.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_off0000d1e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1E2 5140 bytes
SHA-256: 22614c7c0aa2c35631e842feb07cc2d432125514cd405ffff52086d944114f09
font_01_sfnt_off0000e346.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE346 10364 bytes
SHA-256: 4fc796bf14cbda5a50e9b757ff1485720a5a65de91ebf32859ee7f764043d6ca

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