Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b57c8cfdf89eb19…

MALICIOUS

PDF

74.0 KB Created: 2021-02-05 10:50:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-01
MD5: 0c0170b5e6a9f662b9f60f1dc2a4b0e5 SHA-1: e38fa2ae15d2346b325c91a753ae51f048c547bf SHA-256: 1b57c8cfdf89eb190fb708b0f2ea18690e05b36bfd5bf168880d8b64a1e2adc1
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://seumenha.ru/123?utm_term=oregon+dmv+study+guide PDF link annotation
    • https://cdn.sqhk.co/kadeposamo/f8m6brC/95532551962.pdfIn PDF document text
    • http://gratoram.site/hvac_troubleshooting_book94vae.pdfIn PDF document text
    • http://cuzinfo.ru/japanese_translator_app_iphone_cameraz7iq2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424630/normal_5ff322c8c2760.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370744/normal_5ffda87b1fcc9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475397/normal_5ff2baaa7dff1.pdfIn PDF document text
    • http://citrus-fruit.space/72999975033fg2m8.pdfIn PDF document text
    • https://feposogasutam.weebly.com/uploads/1/3/1/3/131384530/jikaworix.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411252/normal_5fe00d459a1df.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391907/normal_5ffc8e73b4825.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379984/normal_5fca91d94aec1.pdfIn PDF document text
    • http://lnstagrambusiness.com/30788520973j43qn.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/dosipive/cbse_5th_grade_math_problems_with_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/likerajatob/ia_dnr_fishing_report.pdfIn PDF document text
    • https://s3.amazonaws.com/jedadokuti/wanasasemidux.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_off0000e5a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5A7 5092 bytes
SHA-256: 5b9f467ce8daea269f54b3ac96f749c0b0705f614ddcff7eac6336990073dcc2
font_01_sfnt_off0000f6f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6F3 10724 bytes
SHA-256: b2c518c86c86d285581ab9b9ddcd0adea5e87e268f42ee63aceb0e423fd28c18