Malicious PDF — malware analysis report

Static analysis result for SHA-256 3904a6656746a756…

MALICIOUS

PDF

76.6 KB Created: 2021-04-25 02:58:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 2b1720999807d25aac076c3dbe96b486 SHA-1: 869d061d8f7bfb7b2c9079cd553ee4fc8aa6ddc9 SHA-256: 3904a6656746a756578d57bc4e9f991a76719a9e3fcdb5d6f59202aff999ddf8
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://jottigo.ru/strik?utm_term=ue+boom+speaker+sync PDF link annotation
    • https://cdn.sqhk.co/kivuwutu/iawlqLZ/18600714474.pdfIn PDF document text
    • https://wotujajatedigi.weebly.com/uploads/1/3/5/2/135295120/lupew_kapesadubojeru.pdfIn PDF document text
    • https://cdn.sqhk.co/noxibogalu/rMQjdib/vafapesinaramirapeparesup.pdfIn PDF document text
    • http://sijemogezabusa.sportsontheweb.net/bow_tie_pattern.pdfIn PDF document text
    • http://zonerokemub.getenjoyment.net/69342031891.pdfIn PDF document text
    • https://karinerojefemof.weebly.com/uploads/1/3/0/7/130775135/selefupobijati.pdfIn PDF document text
    • https://wunabigoji.weebly.com/uploads/1/3/4/8/134891590/gexomejonawavox_tomowobaxusax.pdfIn PDF document text
    • https://buxexemap.weebly.com/uploads/1/3/4/8/134890763/3803242.pdfIn PDF document text
    • http://montana-media.com/how_to_control_someone_mind_with_your_eyes488tv.pdfIn PDF document text
    • http://zugasanuko.getenjoyment.net/88593762802.pdfIn PDF document text
    • http://zunololanuxigu.sportsontheweb.net/16866769355.pdfIn PDF document text
    • http://finansi-7.online/nordictrack_2450_vs_x11ihs3us.pdfIn PDF document text
    • http://latencfsrt.space/zekoludopopovavogowusoler8od2h.pdfIn PDF document text
    • http://ruvinowuge.scienceontheweb.net/29009850297.pdfIn PDF document text
    • https://sigogaxeba.weebly.com/uploads/1/3/4/6/134620414/zinirafifutop.pdfIn PDF document text
    • http://7gusevshop.space/adjective_list_free13jq8.pdfIn PDF document text
    • https://cdn.sqhk.co/fazituku/jiGfjah/xemaduduwos.pdfIn PDF document text
    • http://checkmyscore.info/learn_english_online_free_for_arabic_speakersuncu6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://9c12218e-e157-4070-b33f-4467b3cb42bb.filesusr.com/ugd/0c60a0_fceeae2f93ea4d428c8471aa3afd61d8.pdf?index=trueIn PDF document text
    • https://ac3db616-04cb-40f1-8357-c67041f5e20c.filesusr.com/ugd/eda9ba_ab0758fd43eb42efadbf8878512c289b.pdf?index=trueIn PDF document text
    • https://aa6eca1a-c690-4a36-985e-a873157a80b3.filesusr.com/ugd/081493_12256802f84f42b8b68cd03f26192776.pdf?index=trueIn 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_off0000eb73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB73 5344 bytes
SHA-256: 8d95b601771fb46e1e0a5548711cb3a1a52535b42c4670ae5f3f0b197c921504
font_01_sfnt_off0000fd96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD96 11252 bytes
SHA-256: 7652f3504bbceb9e7ef968d5e17109120b213a293909fce964414a8257e1d131

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