Malicious PDF — malware analysis report

Static analysis result for SHA-256 82f21a515fa839b5…

MALICIOUS

PDF

67.7 KB Created: 2021-02-02 23:37:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-25
MD5: f609cdbd6928357b22068fa73bdcbbad SHA-1: c1a6b8c1158bca21fda2229f695b7e92a00a1705 SHA-256: 82f21a515fa839b5c396fb3cb8e0bfdd3c128eee36d598aa457fb972fedf826a
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/aws?utm_term=casio+edifice+5406+user+manual In PDF document text
    • https://cdn.sqhk.co/molavagew/ge27DK2/kosekopepunanatutel.pdfIn PDF document text
    • https://cdn.sqhk.co/zetobazox/ibib8Iu/large_print_word_search_books_australia.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475208/normal_5ff7c73d54e6f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484363/normal_5fe77fc6ded0d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467318/normal_5ffd4ce2248e1.pdfIn PDF document text
    • https://cdn.sqhk.co/pupevadojas/fjiCg3p/vaxulawusogufade.pdfIn PDF document text
    • https://cdn.sqhk.co/govizanorev/ghmgjAm/super_tank_blitz_gameplay.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501656/normal_600a050b93eb2.pdfIn PDF document text
    • https://cdn.sqhk.co/kewudomavave/djhifz4/halloweentown_movie_rating.pdfIn PDF document text
    • https://cdn.sqhk.co/pemenixa/bfgeIKU/treasure_hunt_movie_cast.pdfIn PDF document text
    • https://cdn.sqhk.co/sotatixorawi/hhahijc/sejowa.pdfIn PDF document text
    • https://melijezaziwoni.weebly.com/uploads/1/3/4/8/134851492/wetoguzebuzik.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4491451/normal_5fcad5449375b.pdfIn PDF document text
    • https://cdn.sqhk.co/pomorezolo/BugeE42/table_football_goal_posts.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/xulepiwa/cara_video_di_twitter_iphone.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_off0000c19e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC19E 5580 bytes
SHA-256: 0294aa7139c1243bf8043974ae154fdfa57f91d5f1e87b03a6bf1759cde4572e
font_01_sfnt_off0000d483.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD483 14476 bytes
SHA-256: 1e44a1640c6acf3607ee0dd48864b16889ba2db8409873d8e8b91afb55664438