Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c99d838d8ec7f96…

MALICIOUS

PDF

65.5 KB Created: 2021-02-05 08:31:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-04
MD5: 1460a84f521da9a19589c7547db70a5f SHA-1: 5c78967b673816cc2c084e47523da479c0159c58 SHA-256: 4c99d838d8ec7f961a4421982cdeb8e0c116b9116defc418df36b6832719071a
196 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
  • 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://bologen.ru/aws?utm_term=weather+report+for+easton+pa PDF link annotation
    • https://cdn.sqhk.co/dodufiruw/ieHhdgc/82913812956.pdfIn PDF document text
    • http://italiahot.space/jk_haru_wa_isekai2fmbr.pdfIn PDF document text
    • http://storedubai.shop/poopdie_mod_apk_1._0._65fee1d.pdfIn PDF document text
    • https://cdn.sqhk.co/wokiwife/jaiiggi/hair_salons_open_in_california_covid.pdfIn PDF document text
    • https://cdn.sqhk.co/lojosexotak/ghMhad2/easy_way_to_record_screen_windows_7_free.pdfIn PDF document text
    • http://bluebadge-support.com/aprender_ruso_gratis0im0g.pdfIn PDF document text
    • http://kolomata.ru/527575438542ybhv.pdfIn PDF document text
    • https://cdn.sqhk.co/linerutinew/REOHXOM/joxegusa.pdfIn PDF document text
    • https://cdn.sqhk.co/futevanu/hdjdghg/rocketman_song_origin.pdfIn PDF document text
    • https://godowipi.weebly.com/uploads/1/3/4/5/134520373/6890008.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/zepifudoxapo/36880653643.pdfIn PDF document text
    • https://s3.amazonaws.com/wivunonovef/whetstone_knife_sharpening_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/rixevozajixezos/mariam_khan_reporting_live_star_cast_name.pdfIn PDF document text
    • https://s3.amazonaws.com/tigewibejageju/75356380185.pdfIn PDF document text
    • https://s3.amazonaws.com/purixifusipelid/312648941.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_off0000c309.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC309 4972 bytes
SHA-256: 2650c5f8dbf24991714b9df4e0314207bde933c0011f1e6931978f5b044afa12
font_01_sfnt_off0000d3f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3F8 10432 bytes
SHA-256: 042fd79df03ee74dbd2177943c18a0c2b80329ae4464d090c9196174fd2dccc3