Malicious PDF — malware analysis report

Static analysis result for SHA-256 1683e8c02cc2c68c…

MALICIOUS

PDF

69.9 KB Created: 2020-11-10 01:23:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-01-23
MD5: 096fe3ad8fc771b64df9add877aa1dc9 SHA-1: 5d2deb038408a460e6b11bac973683d4b0265d7c SHA-256: 1683e8c02cc2c68cac024c47e17fedec75e90a5f4bf5cdd91dbce7f4015060db
196 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://trafffi.ru/aws?keyword=circuit+practice+problems+worksheet PDF link annotation
    • https://kuzaloxamuw.weebly.com/uploads/1/3/1/4/131406684/780453.pdfIn PDF document text
    • https://pexulowiseguwuz.weebly.com/uploads/1/3/4/3/134391342/jiwovabeg-wexolim-muxafevakopusus.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384035/normal_5f8d272c888cf.pdfIn PDF document text
    • https://pevugubak.weebly.com/uploads/1/3/2/7/132740457/4340579.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377647/normal_5f8a80e807e87.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/ruzumeb/sony_discman_d_50_mk2.pdfIn PDF document text
    • https://s3.amazonaws.com/vaxebisapesi/absalom_absalom_chapter_1.pdfIn PDF document text
    • https://s3.amazonaws.com/lomogas/words_beginning_with_shin.pdfIn PDF document text
    • https://s3.amazonaws.com/gulapore/20516539651.pdfIn PDF document text
    • https://s3.amazonaws.com/nademopor/xalazurusibasepufufinumil.pdfIn PDF document text
    • https://s3.amazonaws.com/memul/effortless_english.pdfIn PDF document text
    • https://s3.amazonaws.com/fefurorobumi/fadisedunaluzixupikevij.pdfIn PDF document text
    • https://s3.amazonaws.com/garorowa/how_to_get_your_website_noticed.pdfIn PDF document text
    • https://s3.amazonaws.com/wovitiku/zigujatowamevaj.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_off0000d558.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD558 5376 bytes
SHA-256: 90ed24041e96d5ac31fa8df60f29d93ce8dd1d08e471c210194111dce1422154
font_01_sfnt_off0000e77b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE77B 10444 bytes
SHA-256: d369917f6ec39dd3e2b0125d3550cb9d4ed6c6a161078e2b4de0fa3de59b898a