Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b9f3b4a64525064…

MALICIOUS

PDF

62.3 KB Created: 2021-02-20 03:01:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-04
MD5: 05161390fe512dc5f1e58863a61229ef SHA-1: 420ea5c9b5d8a6781fd853727259d232488f362e SHA-256: 8b9f3b4a64525064c8b3d5bb7894b2b469e2312bea032155b58550a99d151cf7
196 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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://maypoin.ru/strik?utm_term=volume+price+trend+tradingview PDF link annotation
    • https://cdn.sqhk.co/nujoxodove/haqrhgj/assistant_for_android_mac.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417643/normal_6012472f2a6a4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459477/normal_601094d5278ce.pdfIn PDF document text
    • https://cdn.sqhk.co/tajudozizif/hrWxha0/zumikelokijeg.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475559/normal_600e23910d2d0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489583/normal_601eca7649d03.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495526/normal_5fec77633d8a6.pdfIn PDF document text
    • http://ctuxuu.com/board_games_like_chess_and_checkers_crossword3rey0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4468836/normal_5fcd3730f14c2.pdfIn PDF document text
    • https://wopeduvolevim.weebly.com/uploads/1/3/0/7/130776212/1751559.pdfIn PDF document text
    • https://cdn.sqhk.co/gizulakofo/iQaieV0/36771993563.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455405/normal_602163f2ec904.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/makixibawumebol/45640435794.pdfIn PDF document text
    • https://s3.amazonaws.com/vavapekadoliti/how_big_is_the_galaxy_s9_plus_screen.pdfIn PDF document text
    • https://s3.amazonaws.com/tigewibejageju/ansys_fluent_theory_guide_citation.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_off0000b77f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB77F 5332 bytes
SHA-256: 3407f239be49e453fea150d24b2158f00cbe0d561f10a8ca1a4fe4799204f4fc
font_01_sfnt_off0000c9a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9A0 10388 bytes
SHA-256: edecd9726d28366499dbfa6c904bfb608f70b2464badce0b1a530364011348fb