Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a6d62949672c178…

MALICIOUS

PDF

82.2 KB Created: 2021-03-14 18:51:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: a481fc91b8da233ea9eef7c31a58a208 SHA-1: d92004c4e26b00d7961e72a87247c484e511eb8c SHA-256: 5a6d62949672c178c758d4103f28e45dd20e7f1798ac74a8af60749273d1c98c
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It employs SEO link farming and redirectors, specifically using the URL 'https://kuzutuzo.ru/wix?keyword=a+beginner%2527s+guide+to+day+trading+online+pdf' to lure victims with a trading guide pretext. The ML classifier also strongly indicated maliciousness.

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
  • 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://kuzutuzo.ru/wix?keyword=a+beginner%2527s+guide+to+day+trading+online+pdf PDF link annotation
    • https://vagewojevibo.weebly.com/uploads/1/3/4/8/134873572/7ae238.pdfIn PDF document text
    • https://cdn.sqhk.co/gigatakel/aT7ogfv/uber_driver_app_download_android.pdfIn PDF document text
    • https://cdn.sqhk.co/nogojexibawa/6jcUixe/shooting_times_duck_hunting_wisconsin.pdfIn PDF document text
    • https://cdn.sqhk.co/pajokiman/dxifigv/vefuwejak.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366366/normal_602e5b0ae786b.pdfIn PDF document text
    • https://cdn.sqhk.co/woguwubege/jhcFngh/ate_up_all_the_cake_lyrics.pdfIn PDF document text
    • https://cdn.sqhk.co/lerapuraroke/fBOydgg/call_of_duty_zombies_apk_ios.pdfIn PDF document text
    • https://lanuwoga.weebly.com/uploads/1/3/1/6/131637333/gusisakuwa.pdfIn PDF document text
    • https://cdn.sqhk.co/xusawikorut/jigfjeW/44534078904.pdfIn PDF document text
    • https://cdn.sqhk.co/tijaxasazuwi/lcSluf6/icy_veins_wow_classic_hunter_guide.pdfIn PDF document text
    • https://cdn.sqhk.co/sunawopi/ngdkKoM/download_game_alien_shooter_2003.pdfIn PDF document text
    • https://cdn.sqhk.co/luketopaja/hjejbji/gefojefinosezigadif.pdfIn PDF document text
    • https://xutifapob.weebly.com/uploads/1/3/2/7/132712150/ragos_remizilo_visabo_narogelavo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483837/normal_602a532570023.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/b2bdb6a5-f807-434d-9fe4-d22870dc5fb1/6079455103.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/26f01232-2dc9-48e4-b11f-c261a274b042/65529763075.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/14dde122-f13c-4d7b-97e5-71261950b378/types_of_organizational_culture_handy.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c975d40f-d86d-42be-9bb3-2a34f7c17c78/blue_team_handbook_incident_response_edition_ebook.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bbcfd7fb-25cb-4b72-a2c2-25d3fd5bb7f2/reruvapexinukum.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_off00010214.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10214 5472 bytes
SHA-256: a5534a9fec2720e473ed9f25a5761a9d9df2122fdd0d8877ff6fd4eea5e74ac9
font_01_sfnt_off000114d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114D2 11212 bytes
SHA-256: ec0a1ee6e1e819d3bb1c5ff1983ed79a879c1cfa036c4b6d2ac8aa37a073fb52