Malicious PDF — malware analysis report

Static analysis result for SHA-256 806425ba74f20ded…

MALICIOUS

PDF

67.8 KB Created: 2021-02-19 00:44:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-04
MD5: 71dec47d24941d29f43791a893435590 SHA-1: 92126b0356abb66434012be980fe5a8a3abb2d93 SHA-256: 806425ba74f20ded0800f0aa3dbd15d2f3a6f2a238171e96cedc5229fdf8b59d
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/wb?keyword=average%20salary%20of%20software%20test%20engineer%20in%20us In PDF document text
    • https://vajinivokesele.weebly.com/uploads/1/3/5/3/135326698/dofom_kodeweradun_fexati.pdfIn PDF document text
    • http://tranquils.space/good_night_videos_for_whatsapp_free_downloadjntdd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387815/normal_5ff0a78bd8102.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4466366/normal_5ffdef9019868.pdfIn PDF document text
    • http://formblckr1.xyz/2019_ashrae_handbook_hvac_applicationik2a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371247/normal_5fd19499902dc.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/lovomijelun/93938909498.pdfIn PDF document text
    • https://s3.amazonaws.com/tamobalasu/daily_expense_report.pdfIn PDF document text
    • https://s3.amazonaws.com/rogugagatuf/albert_einstein_biography_in_english.pdfIn PDF document text
    • https://s3.amazonaws.com/lanaladu/cocoon_insect_shield_line_travelsheet_silk.pdfIn PDF document text
    • https://s3.amazonaws.com/dopugaxelelema/black_and_decker_belgian_waffle_maker_instructions.pdfIn PDF document text
    • https://s3.amazonaws.com/tapexiw/zulugupubavurezo.pdfIn PDF document text
    • https://s3.amazonaws.com/wezukep/commando_game_2.pdfIn PDF document text
    • https://s3.amazonaws.com/tubukeganuji/57616280393.pdfIn PDF document text
    • https://s3.amazonaws.com/mesixadelomomo/outdoor_advertising_company_profile.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_off0000cb8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB8B 5176 bytes
SHA-256: 45e7070ec620fbbe5ab338f9624e838ccf3ad942efa951537544b887dd3af97e
font_01_sfnt_off0000dd59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD59 10856 bytes
SHA-256: 5419df6bda62379728dc3ec99bf9abab234198928233f7b0531b2aa9bfe052c0

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