Malicious PDF — malware analysis report

Static analysis result for SHA-256 9548c42bc49bd7e0…

MALICIOUS

PDF

70.6 KB Created: 2021-02-02 01:39:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-25
MD5: 6e9009f95e3b42e14e97c62e91cd8664 SHA-1: cebf2c5d23a2f437b02a27ad6f3a171f6132f6bb SHA-256: 9548c42bc49bd7e07fa19f26cd7a9c71421d970bd81341fe3b6f69fe0a67bcb2
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://crophysi.ru/aws?utm_term=instagram+direct+mod+apk In PDF document text
    • https://cdn.sqhk.co/niwonosorude/ieetbgd/water_parks_in_ohio.pdfIn PDF document text
    • https://cdn.sqhk.co/kisudosus/Vj0Shjz/gukimilopenixi.pdfIn PDF document text
    • https://cdn.sqhk.co/butiluluvuk/YRphdja/wheelie_challenge_download_ios.pdfIn PDF document text
    • https://cdn.sqhk.co/jekefebiba/sfyjfgj/moto_ride_game_download.pdfIn PDF document text
    • https://furetexagorude.weebly.com/uploads/1/3/5/9/135958868/f99c72b1.pdfIn PDF document text
    • https://cdn.sqhk.co/kominepoli/oq6nOgg/sports_stickers_for_iphone.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385421/normal_6011eddd683cf.pdfIn PDF document text
    • https://cdn.sqhk.co/lopokevofoti/haij3qz/craftsy_app_not_working.pdfIn PDF document text
    • http://everydayy.fun/lugevaredodikubomipajuvilq17rh.pdfIn PDF document text
    • https://cdn.sqhk.co/kisilusotuke/fYic7gh/city_racing_3d_hack_apk_2017.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384825/normal_5ffe6ef9455ab.pdfIn PDF document text
    • https://cdn.sqhk.co/vusutazomaga/jMFijJC/infectonator_world_dominator.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467593/normal_5fcaf96cb1d8c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368759/normal_5feb78d97af56.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/fekaduvopigab/3609363099.pdfIn PDF document text
    • https://s3.amazonaws.com/bidivo/gadakisakaj.pdfIn PDF document text
    • https://s3.amazonaws.com/xapijifas/nfhs_concussion_course_test_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/vatosolikijike/98835824525.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_off0000da95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA95 5360 bytes
SHA-256: 26cf478342fc80fcf14aed87005b738d0441715b8e5b622087d046354b021764
font_01_sfnt_off0000ecc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECC1 9596 bytes
SHA-256: dff3972263b2b3a5ff8042ddddec95097c0b663d37293c4c526db335a1bf4761

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