Malicious PDF — malware analysis report

Static analysis result for SHA-256 7cd10c5bf2581e86…

MALICIOUS

PDF

92.7 KB Created: 2021-03-20 07:08:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: ca5bef568584dc0c2b2c4eb334bcd1b3 SHA-1: e74c71d5621975209b9f30e4bdc973f59a250ae0 SHA-256: 7cd10c5bf2581e8628ff54861d6aaf31d1a05cc3b0181aeec4c93e7d969363ce
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 0.9996

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://dafemum.ru/wix?keyword=thus+with+a+kiss+i+die+analysis PDF link annotation
    • https://fojaxekixuwid.weebly.com/uploads/1/3/4/7/134743661/gewopu.pdfIn PDF document text
    • https://cdn.sqhk.co/rufigukuj/R45HXJt/2_guns_movie_star_cast.pdfIn PDF document text
    • https://xewulowew.weebly.com/uploads/1/3/4/7/134757629/e59941359.pdfIn PDF document text
    • https://dolunejasuvufa.weebly.com/uploads/1/3/0/7/130776008/a746446123aaf0b.pdfIn PDF document text
    • https://cdn.sqhk.co/bagadogod/igc0Xia/motor_vehicle_bill_of_sale_nj.pdfIn PDF document text
    • https://cdn.sqhk.co/sofizagumup/jaYfifK/ding_dong_school_books.pdfIn PDF document text
    • https://sowurudiz.weebly.com/uploads/1/3/1/4/131438308/125c2ee9d1a.pdfIn PDF document text
    • https://wugepazi.weebly.com/uploads/1/3/4/3/134348030/fumiputolimu.pdfIn PDF document text
    • https://pejilajapife.weebly.com/uploads/1/3/4/4/134477767/ae9ab1a0249.pdfIn PDF document text
    • https://cdn.sqhk.co/denirinodo/YljePhc/koat_weather_team.pdfIn PDF document text
    • https://nakigere.weebly.com/uploads/1/3/4/6/134608851/4793843.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
    • https://uploads.strikinglycdn.com/files/b98c3d3b-7dcb-4bbf-8466-f6c95727dc6f/what_choke_tube_for_browning_a5.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/68b094a7-8c2d-4cbe-a92c-5cf7736aab84/consider_a_cylindrical_specimen_of_a_steel_alloy_15.0_mm_in_diameter.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b85fb1be-7056-4902-9863-6a064f75127b/62406868691.pdfIn PDF document text
    • http://labomodofu.epizy.com/25918492527.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e8a8d196-b0e7-4c91-92d9-e4743903adaf/neato_botvac_d5_connected_parts.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/78065ed7-cb72-4aa6-90fc-5e4bd00efd15/84978462933.pdfIn PDF document text
    • http://xejapudef.epizy.com/fululovisurulufeligewona.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/875df9b2-2f0a-418a-8616-cd23ee41a194/6913581854.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8fd8a266-9db5-4454-97af-fca3cbf50390/med_surg_certification_study_book.pdfIn PDF document text
    • http://nokonasaxe.epizy.com/free_weekly_planner_template_2019.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_off000121cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121CD 4796 bytes
SHA-256: 4f02456e0ade4cade23cd698ebfe875a5c621569c27d6bfc4b39d941df7774b6
font_01_sfnt_off00013219.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13219 10928 bytes
SHA-256: b0819654fe754467d27b3c3a4b87b22e73d73a203eeadd78ae8444f73b3da404
font_02_sfnt_off00015763.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15763 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230