Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b84746da3d057e5…

MALICIOUS

PDF

72.8 KB Created: 2021-01-26 15:28:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: c9eae412fb6ad73ef5562b1f8ee0aad8 SHA-1: 60da3f3d9b7ad6222d6ef443e1f8762c3b6c10fb SHA-256: 3b84746da3d057e507e9380206890cad180d9d5280dc1b96ae62a14a91dbb6e1
244 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to disposable domains and are likely part of a link farm for SEO manipulation or to distribute malicious content. One critical heuristic indicates a link to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://ggtraff.ru/wb?keyword=fish%20aquarium%20decoration%20ideas%20at%20home In PDF document text
    • https://cdn.sqhk.co/wadusazilox/ihfZhh4/can_you_escape_the_room_7_level_12.pdfIn PDF document text
    • https://guxitokos.weebly.com/uploads/1/3/2/6/132681611/9844309.pdfIn PDF document text
    • https://cdn.sqhk.co/letijefa/Cjgiahe/39082600598.pdfIn PDF document text
    • http://gebajajax.22web.org/35587356440.pdfIn PDF document text
    • https://sekugiwa.weebly.com/uploads/1/3/0/7/130739582/6174928.pdfIn PDF document text
    • https://cdn.sqhk.co/wolitobutak/bge1ETW/duwawezis.pdfIn PDF document text
    • https://subijiderekura.weebly.com/uploads/1/3/4/6/134616270/vojumutejeg.pdfIn PDF document text
    • https://cdn.sqhk.co/bugolajoxodu/hwie6hc/vubosilojebolofelirifu.pdfIn PDF document text
    • https://cdn.sqhk.co/kagurase/2cpgcdD/penguin_running_towards_mountains.pdfIn PDF document text
    • https://xoxopurotawasuj.weebly.com/uploads/1/3/4/6/134651309/9459654.pdfIn PDF document text
    • https://cdn.sqhk.co/libavesonon/cOpjejf/upcycle_wedding_dress_diy.pdfIn PDF document text
    • http://idealslimitaly-ufficiale.site/the_survival_hunter_games_2_pc_free_downloadq25nq.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rokabimokow.rf.gd/elementary_introduction_to_statistical_learning_theory.pdfIn PDF document text
    • http://xovigukesejibem.rf.gd/bus_parking_games_free_full_version.pdfIn PDF document text
    • http://sabukizazuse.epizy.com/s_name_wale_whatsapp_status_video.pdfIn PDF document text
    • http://fepadegan.epizy.com/61095796133.pdfIn PDF document text
    • http://gidorewen.rf.gd/73631433981.pdfIn PDF document text
    • http://monulaw.epizy.com/watabarabuti.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_off0000df9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF9D 5228 bytes
SHA-256: eed0233e90de863d1c28d10a30c643f9a2e19268b64571ee0e3c09ebbbdb8290
font_01_sfnt_off0000f136.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF136 11204 bytes
SHA-256: a6b180fd08f48d2368c8391b1832adc89e2740b20f305eaa0a79a156141a0b79

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