Malicious PDF — malware analysis report

Static analysis result for SHA-256 82c476fa6c1705e3…

MALICIOUS

PDF

68.7 KB Created: 2021-02-19 11:48:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-01
MD5: 9512ece8f03a594b0ba75978de530cc5 SHA-1: 462e288e6424627212b2781940ddb51cfef77631 SHA-256: 82c476fa6c1705e30c278c6fdb61aa3be3b26cc7f1be2151d8709d3308d59e78
254 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
  • 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/aws?utm_term=does+using+a+waterpik+help+whiten+teeth In PDF document text
    • https://static.s123-cdn-static.com/uploads/4454056/normal_5fc5e8b33797d.pdfIn PDF document text
    • https://zujujogonawanuk.weebly.com/uploads/1/3/4/8/134879196/347826c.pdfIn PDF document text
    • https://duditoza.weebly.com/uploads/1/3/2/3/132302736/kolalaxom.pdfIn PDF document text
    • https://duzetokip.weebly.com/uploads/1/3/4/4/134404829/7621902.pdfIn PDF document text
    • https://nibebelijatod.weebly.com/uploads/1/3/1/4/131452937/393948.pdfIn PDF document text
    • http://wisitens.online/283270696058cw59.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372086/normal_5feb4fc32bfde.pdfIn PDF document text
    • http://dektesheff.xyz/odd_eyes_dragon_ys14tarkh.pdfIn PDF document text
    • http://movasolusid.iblogger.org/how_to_return_letters_to_sender_uk.pdfIn PDF document text
    • http://tamakar.xyz/56698811906g4qd6.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/jezaxojipevu/leloxetilaxufiregosilav.pdfIn PDF document text
    • https://s3.amazonaws.com/wovugi/rocket_league_reddit_cross_platform.pdfIn PDF document text
    • https://s3.amazonaws.com/tokit/formation_of_cilia_and_flagella.pdfIn PDF document text
    • https://s3.amazonaws.com/jewizopukuni/sheets_of_a4_paper_per_tree.pdfIn PDF document text
    • https://s3.amazonaws.com/numegubowalonan/distribution_agreement_template_doc.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_off0000cf85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF85 5236 bytes
SHA-256: 8d87fc32ad9364d9a8f1e3ef4e91b881a2389f773bbcfe607f5a00ea1a919dcd
font_01_sfnt_off0000e16c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE16C 10612 bytes
SHA-256: 305eb3cf2c90f6336126ddd5ecb342670d201f6b7bb773ab8d06d36e413afc1e

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