Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9b5d9b82caa4483…

MALICIOUS

PDF

82.3 KB Created: 2021-03-03 22:20:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: f937938c0c295ed9a68023cc947aa098 SHA-1: 130b18944e73cf675f74a686ef53323b37ed6bd3 SHA-256: f9b5d9b82caa4483739b5a74c16a12bcb2514b9cf6b50fa9890cc8fb47ae55b4
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 0.9998

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.
  • 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=2002+f250+7.3+transmission+fluid+capacity PDF link annotation
    • http://wutopezogegusi.getenjoyment.net/double_bar_graph_worksheets_7th_grade.pdfIn PDF document text
    • https://cdn.sqhk.co/wajuletixex/DPgftKr/call_of_mini_brawlers_mod.pdfIn PDF document text
    • https://cdn.sqhk.co/kenujowemi/jhjBQ9f/square_quickbooks_inventory.pdfIn PDF document text
    • https://cdn.sqhk.co/disonixures/gfVjcif/pen_pineapple_apple_pen_remix_mp3.pdfIn PDF document text
    • https://cdn.sqhk.co/ribegibonot/geifJXk/mobile_facebook_messages.pdfIn PDF document text
    • https://xewaxamuroz.weebly.com/uploads/1/3/4/5/134529724/jitena.pdfIn PDF document text
    • https://cdn.sqhk.co/geruxibab/jhimjcY/photo_editor_app_for_android_offline.pdfIn PDF document text
    • http://bomepufibawil.scienceontheweb.net/wu_tang_saga.pdfIn PDF document text
    • http://gisoboxizaza.mygamesonline.org/graco_milestone_all-in-one_car_seat_user_manual.pdfIn PDF document text
    • https://kasorewo.weebly.com/uploads/1/3/2/7/132740312/5125405.pdfIn PDF document text
    • https://cdn.sqhk.co/kisasizaro/fieyQjg/samsung_galaxy_watch_active_2_health_features.pdfIn PDF document text
    • https://mugunerer.weebly.com/uploads/1/3/4/4/134479547/5692040.pdfIn PDF document text
    • https://wusedutewaxugag.weebly.com/uploads/1/3/1/4/131437839/1319043.pdfIn PDF document text
    • https://gunajogozezulom.weebly.com/uploads/1/3/5/3/135385825/3f9db10838ae.pdfIn PDF document text
    • https://cdn.sqhk.co/libobivole/oOheojh/live_streaming_news_fox_boston.pdfIn PDF document text
    • http://guzexesuge.mypressonline.com/how_to_win_and_influence_friends_by_dale_carnegie.pdfIn PDF document text
    • https://dowogejur.weebly.com/uploads/1/3/5/9/135992185/676d9aa4dc.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://lupixopuvir.onlinewebshop.net/how_to_get_rid_of_descale_message_on_keurig_supreme_plus.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_off0000eaea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAEA 5744 bytes
SHA-256: 47bcd5fabd6d9fdb45f58bad08be0f0b64c13d90d513a269ebc268b4cfa2fe00
font_01_sfnt_off0000fe57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE57 15264 bytes
SHA-256: 18feaeb242c96e549dd41f1d203ddbf225264c3ce45882d2dbdeaabef2bbbf5d
font_02_sfnt_off00012d8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D8E 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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