Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bb6b8428e9d6bfe…

MALICIOUS

PDF

72.4 KB Created: 2021-02-09 17:28:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-25
MD5: 0f57b50cc05fbd83b8148dbb7f6df7aa SHA-1: 8e7d1454f2cdba5d124607d8e581670d713854fa SHA-256: 4bb6b8428e9d6bfe5ebfe2ffa0a259f7a1277ed8593c7e6973bc95393ae10322
254 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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/wb?keyword=heart%20shaped%20flower%20template In PDF document text
    • http://osthondroz.com/angular_ivy_renderer_performance2qmhx.pdfIn PDF document text
    • http://haifaiv.ru/how_to_complete_brain_out_level_38vac6j.pdfIn PDF document text
    • https://cdn.sqhk.co/wuluzajiroz/ggjwFh2/download_game_boxing_star_mod_apk_terbaru.pdfIn PDF document text
    • https://cdn.sqhk.co/veletafi/jhN5oih/tedifuzatiwejololimig.pdfIn PDF document text
    • https://cdn.sqhk.co/fularulojoze/6shfmgi/sw_tor_sounds.pdfIn PDF document text
    • https://cdn.sqhk.co/fivodewile/dEffjf8/atomus_hd_live_wallpaper_1._9_apk.pdfIn PDF document text
    • https://pabarasoziraw.weebly.com/uploads/1/3/5/3/135324669/duraxiwixuraf.pdfIn PDF document text
    • https://cdn.sqhk.co/wadalibituge/Oghighj/the_chosen_app_for_fire_stick.pdfIn PDF document text
    • http://austritkfa.com/tusibenogizawodobemepodw7xud.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/vuxalirudidel/sheet_music_app_that_turns_pages_android.pdfIn PDF document text
    • https://s3.amazonaws.com/zodererezuzuxi/battery_usage_app_android.pdfIn PDF document text
    • https://s3.amazonaws.com/vonuxagupeduze/akira_movie_song_320kbps.pdfIn PDF document text
    • https://s3.amazonaws.com/liwara/70564919265.pdfIn PDF document text
    • http://nipufafinera.epizy.com/50669732130.pdfIn PDF document text
    • https://s3.amazonaws.com/pewibim/free_promissory_note_template_illinois.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_off0000dc22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC22 5336 bytes
SHA-256: 6451489ee7facdacaff3cb4a01afe4923cd60eb6d4e87a7daa8fa0be209e04ab
font_01_sfnt_off0000ee31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE31 11284 bytes
SHA-256: d37b85a7ff51e55facb39677030e30b034505d62ecd7c529ee972976e6e661cb

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