Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbf3e13bc7c6eebb…

MALICIOUS

PDF

92.5 KB Created: 2021-03-02 19:02:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 4526a5b33086d2e32545603fd5c6cbe2 SHA-1: 67bd80ad069f3e26af05d9b96c0e2a6e890d686d SHA-256: bbf3e13bc7c6eebbed5b2de38aeed75d5bc94df52c980f715d2f8d3f8bf54866
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, which is characteristic of a link farm designed to redirect users to potentially malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the embedded URLs and link farm heuristic suggest the primary attack pattern is to direct users to external malicious sites.

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
  • 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.
  • 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://ponafet.ru/123?utm_term=watch+pride+and+prejudice+%25282005%2529+online+free+123movies PDF link annotation
    • https://cdn.sqhk.co/jidevumedure/giaEIgh/ball_sort_puzzle_level_1075.pdfIn PDF document text
    • http://nanebaxexob.getenjoyment.net/68692804487.pdfIn PDF document text
    • https://cdn.sqhk.co/xitilesuxiw/eGigeTZ/printable_checklist_template_word.pdfIn PDF document text
    • https://rugovisatef.weebly.com/uploads/1/3/2/6/132682701/adba64f35923751.pdfIn PDF document text
    • http://fibutogu.mywebcommunity.org/62790047832.pdfIn PDF document text
    • http://wisatemubudu.medianewsonline.com/274432540.pdfIn PDF document text
    • https://cdn.sqhk.co/muvotugi/Dt7iiR6/papikumegagupaze.pdfIn PDF document text
    • https://tifalexax.weebly.com/uploads/1/3/4/4/134471923/2228314.pdfIn PDF document text
    • https://cdn.sqhk.co/mikedeto/iajg53v/equalizer_pro_apk.pdfIn PDF document text
    • https://bugajujifupub.weebly.com/uploads/1/3/4/8/134894919/pobefonibitokufi.pdfIn PDF document text
    • https://cdn.sqhk.co/pitekofotada/4k77G62/5186858626.pdfIn PDF document text
    • http://sevagawos.getenjoyment.net/rinnai_rh180_problems.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://jatoxat.atwebpages.com/sutolixiduxenuriduxag.pdfIn PDF document text
    • https://s3.amazonaws.com/kisagoz/zerepevikaxadexa.pdfIn PDF document text
    • http://bogalibamadom.myartsonline.com/94114268755.pdfIn PDF document text
    • https://s3.amazonaws.com/woxewiwupir/affinity_publisher_full.pdfIn PDF document text
    • https://s3.amazonaws.com/mejobu/moxuziwumar.pdfIn PDF document text
    • https://s3.amazonaws.com/vufupu/palevixevubikasirazen.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011ced.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CED 6196 bytes
SHA-256: babd494e0586ff73b3779344d82a2ae5edfb95f76268050cf6f750d8198d23ce
font_01_sfnt_off000131fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131FD 10520 bytes
SHA-256: a7bb9ecdb0141707474b696a85fd26e7b23a80f542b99c4198765253861d03bc
font_02_sfnt_off00015606.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15606 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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