Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d9e344953d0de09…

MALICIOUS

PDF

80.5 KB Created: 2021-05-14 06:06:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: a0f26be69b0462d92358bb6b476a95b0 SHA-1: 808385a802549b741a966d94a62926f49cb7416a SHA-256: 7d9e344953d0de0990722e115b748c4ea58bc1c2c507d147263b004925517917
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm designed to distribute traffic to various potentially malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and numerous external links point towards a malicious document designed to redirect users.

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=construction+safety+documents PDF link annotation
    • http://zisumabegol.22web.org/16_mhz_crystal_oscillator.pdfIn PDF document text
    • http://memaberenux.scienceontheweb.net/toyota_motor_annual_report_2020.pdfIn PDF document text
    • http://tekirivira.iblogger.org/11648236566.pdfIn PDF document text
    • https://safusubugem.weebly.com/uploads/1/3/4/6/134609944/duwarodorixu_zilul.pdfIn PDF document text
    • https://xipumizi.weebly.com/uploads/1/3/4/7/134746986/90bd8c19529.pdfIn PDF document text
    • http://nupesupo.mypressonline.com/87752759270.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jinelod.rf.gd/rheem_tankless_water_heater_sizes.pdfIn PDF document text
    • https://cad90261-f038-4e8a-b384-2e0e37e6cb8c.filesusr.com/ugd/4c4e45_d23d664f991e4c2eb9af3aff105a6f4a.pdf?index=trueIn PDF document text
    • http://tiwebukesa.epizy.com/home_finance_excel_spreadsheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0d0ff478-8855-4eb9-b7b0-c111766d031a/the_three_questions_don_miguel_ruiz_quotes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/056a63f5-6e2e-4183-81bf-a7b8f198966e/what_is_the_formula_for_blood_flow.pdfIn PDF document text
    • https://d934ed86-632c-4751-b35b-4303166f997e.filesusr.com/ugd/be0f55_c714ce6d84014ff286176fb0a1ed0623.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ce88b8a8-262c-4700-96dc-f9417f2e2b46/pirejeko.pdfIn PDF document text
    • http://kifobidurusidi.epizy.com/62350998365.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eb02c267-6a0a-4d36-8b22-c1187fccc94a/21534875480.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a38593e6-9a2f-4a07-a50a-b11cacc64c67/cant_see_cursor_on_windows_10.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c7a319ec-dbc7-4b0b-9d2f-4ae7c845e1c7/evenflo_car_seat_installation_video.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0ae62afb-d4fa-45f0-a8f4-4878c1e4f967/dirt_devil_ultra_hand_vac_manual.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_off0000ff0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF0D 5140 bytes
SHA-256: 3c0e6242d7f4d49d9c682e8f47e509b49877405f16bf99a642a7ba013bea2349
font_01_sfnt_off0001107c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1107C 10672 bytes
SHA-256: ed9525ff050fecac672ff8cd5be7f16c28024cdf37305a777f7746c92b8f0142