Malicious PDF — malware analysis report

Static analysis result for SHA-256 3442618a193d5840…

MALICIOUS

PDF

75.2 KB Created: 2021-04-11 14:53:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 1e58f503bd10553e28caa4a998655ed0 SHA-1: b38fe1492989216d36cfbe9bce1ce00269b8dcaf SHA-256: 3442618a193d58405d924e9e4d1f20856c3be3d85f8a05ff87d71147dcf35490
234 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link T1059.007 JavaScript T1071.001 Web Protocols

This PDF document exhibits characteristics of a phishing or malware distribution lure. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of a 'remote-support tool lure' heuristic, combined with the embedded URLs, indicates a likely attempt to trick the user into downloading or connecting to a remote support tool, which could be a pretext for malware delivery or unauthorized access. The ClamAV detection further solidifies its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 8

  • 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.
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://vilenefex.ru/strik?utm_term=how+to+add+stickers+to+goodnotes PDF link annotation
    • https://cdn.sqhk.co/joxezexukub/hhhYfEZ/juzojem.pdfIn PDF document text
    • https://cdn.sqhk.co/mifigatira/fijje4Y/monster_truck_show_2020_jim_falls_wi.pdfIn PDF document text
    • https://cdn.sqhk.co/xenumobavun/q1iijgU/waifu_or_laifu_ios_download.pdfIn PDF document text
    • https://danikobunib.weebly.com/uploads/1/3/4/7/134755608/2652138.pdfIn PDF document text
    • https://cdn.sqhk.co/xusawikorut/GvVPWge/85776664707.pdfIn PDF document text
    • https://siwusoxol.weebly.com/uploads/1/3/4/5/134584737/3c6c04df07607.pdfIn PDF document text
    • https://cdn.sqhk.co/fidisutipamu/hfiihdD/parent_plus_loan_origination_fee_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/fepogosu/jfEJsii/the_trip_to_italy_soundtrack.pdfIn PDF document text
    • https://cdn.sqhk.co/kululojilo/7EatC9R/85376496627.pdfIn PDF document text
    • https://cdn.sqhk.co/kukisigafumi/gebHifR/teamviewer_quicksupport_download_windows.pdfIn PDF document text
    • https://cdn.sqhk.co/xuwedizisor/jjliNKO/fakapidemuzebidabude.pdfIn PDF document text
    • https://cdn.sqhk.co/zumedizojas/6jfNjfD/dino_rampage_simulator.pdfIn PDF document text
    • http://mapebudo.getenjoyment.net/wegosox.pdfIn PDF document text
    • https://cdn.sqhk.co/xovujiroveg/ifibfjc/word_search_app_for_money.pdfIn PDF document text
    • http://setokanekema.mygamesonline.org/ibm_lenovo_beep_codes.pdfIn PDF document text
    • https://cdn.sqhk.co/dafibuxoki/y6hejcj/nuganupe.pdfIn PDF document text
    • https://cdn.sqhk.co/mujekesire/4hf4hdK/jinezuj.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://425e2ee7-996f-4c6d-a593-b44a2a39b733.filesusr.com/ugd/bb05c1_baa152fa83cb45b190a88b1eed8c6107.pdf?index=trueIn PDF document text
    • https://761e60ea-5e0e-4c43-b4c2-f6a9045c608d.filesusr.com/ugd/545033_d71053f491da4393b84eed0b1ed527e5.pdf?index=trueIn PDF document text
    • https://01c4c9a3-ee74-4db9-a65d-799443b8dbf1.filesusr.com/ugd/a64c8c_3426173c6f364ab19814edc7d41d6cb7.pdf?index=trueIn PDF document text
    • https://460eb545-5389-4aa9-9e78-d1074a8bca0c.filesusr.com/ugd/21a131_c2f75a9fde60455b8cd9407bf3e3802c.pdf?index=trueIn PDF document text
    • https://07a970a6-a864-461d-ba0c-8deda34efc75.filesusr.com/ugd/b56c0d_5a5cc1af2be8470a8f15a29fbdc2bc5f.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_off0000e8db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8DB 5192 bytes
SHA-256: 03f014ef5a665973f4980a873b00b4f4903ff098c7edb86e6708b3d5fe52949e
font_01_sfnt_off0000faad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAAD 10804 bytes
SHA-256: 556d3854fe2e4a6d066cce1828678e7953ac17f8ac62cb10bbdc67c77b4a328c

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