Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8f3f23a569d9177…

MALICIOUS

PDF

68.9 KB Created: 2021-02-11 17:24:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-25
MD5: a9ed4e2b23845494a90984bf827e164e SHA-1: affefe82b3b07c409519d3b4ac923855e1ddf17c SHA-256: b8f3f23a569d91772ad9a0bd4d5ac2f0f025c5dd2c0a350d24927b63b2d60901
204 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://druttle.ru/wb?keyword=arch%20linux%20gui%20install%20guide PDF link annotation
    • https://guxedujigizos.weebly.com/uploads/1/3/4/7/134735137/6992988.pdfIn PDF document text
    • http://buloshnaya.site/corporate_identity_design_template_ideasmqmm0.pdfIn PDF document text
    • http://vovpomnim.ru/b_pharmacy_syllabus_2nd_year_201818p9k.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460266/normal_60238df0aaab2.pdfIn PDF document text
    • https://sepiximefajo.weebly.com/uploads/1/3/4/8/134849953/kafavubaxet.pdfIn PDF document text
    • http://apelsins.space/acoustic_guitar_sounds_muffledfwd5y.pdfIn PDF document text
    • https://puxonuge.weebly.com/uploads/1/3/1/3/131383548/jivaredar-jevugujebop.pdfIn PDF document text
    • https://dufevirefat.weebly.com/uploads/1/3/1/4/131438490/jalivijowoja.pdfIn PDF document text
    • http://itagreen.fun/kebovmmu5i.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417423/normal_5ff3d73491e35.pdfIn PDF document text
    • http://krokoboko6.xyz/blank_business_card_template_word_freeye1uj.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/purufiz/basic_terminal_commands_ubuntu_linux.pdfIn PDF document text
    • https://s3.amazonaws.com/tapexiw/vpn_gate_client_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/vonutavekip/performance_string._format_vs_concatenation_c.pdfIn PDF document text
    • https://s3.amazonaws.com/tudawufed/wager.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_off0000d042.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD042 5256 bytes
SHA-256: ab18539bd4fc4c1a6a60064e9fb3936c4ea17190e1cc0f00200f14ec0179c6ee
font_01_sfnt_off0000e224.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE224 10832 bytes
SHA-256: 5609b48837c146996b0521cf5bcd6ce9837a7b38da45582fb8dc3faad6eb999d