Malicious PDF — malware analysis report

Static analysis result for SHA-256 2391d4908c7908f8…

MALICIOUS

PDF

76.7 KB Created: 2021-03-22 02:26:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: abcb8acfd3a298cbab703b18d612b981 SHA-1: 3686096108f05b815df9d4b6efb4e2096276c0bb SHA-256: 2391d4908c7908f82afdf79ff3fa795ab39797ceb8dfa3caef4c9cce2c1ad07e
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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/wix?keyword=genetic+disorder+webquest+answer+key PDF link annotation
    • https://cdn.sqhk.co/xenivoronizu/ghrPig9/truck_wallpaper_hd_1920x1080_4k.pdfIn PDF document text
    • https://rediwugozuza.weebly.com/uploads/1/3/1/4/131438197/kilenuluvepi.pdfIn PDF document text
    • https://cdn.sqhk.co/lusajiki/aiaX8uR/hd_wallpapers_widescreen_2560x1080.pdfIn PDF document text
    • http://stroiline74.ru/rewapozorisumorivinjbfw.pdfIn PDF document text
    • https://cdn.sqhk.co/dapubebireba/hcdhajb/bikopefowidagozujipes.pdfIn PDF document text
    • http://dhl-order.info/marine_corp_drill_instructor_speech5ehp7.pdfIn PDF document text
    • https://cdn.sqhk.co/leruwexikud/iaOPzjh/lozivelopadixow.pdfIn PDF document text
    • https://warubexe.weebly.com/uploads/1/3/4/6/134647576/dawolab.pdfIn PDF document text
    • http://pudevivufug.22web.org/fivuxanidefejitu.pdfIn PDF document text
    • https://xateboduf.weebly.com/uploads/1/3/1/4/131483383/ca758d5f2d06dd4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/de1edbf9-2178-41d0-9835-f4fa750cb1e6/39824158537.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/645f51aa-6bd1-493f-b72a-1e8c395cd5a4/gagaj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aa388a51-28b1-41ee-8f53-9cbf7da6c720/what_is_the_best_facial_steamers_to_buy.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/229ce648-04ef-45b4-a11d-b8b1657c7de3/40902853043.pdfIn PDF document text
    • http://wobazopaf.epizy.com/microsoft_chromium_edge.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a8d90083-3f64-48bb-ac11-3e9f69c5067e/niwosamuwituronetojizin.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1b6cc2da-34cc-407f-861a-3b193ab17164/how_long_do_you_cook_pizza_rolls_on_a_pizzazz.pdfIn PDF document text
    • http://rixuzomobe.epizy.com/464259849.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/65cb7328-47b1-4b51-b25f-12f716f637e1/the_blind_side_film_review_essay.pdfIn PDF document text
    • http://durunorutap.epizy.com/64891180514.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a39daeba-157f-48ac-9f87-8fe8f68d8ac2/2989115647.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f0dbcbbd-5bc4-4c14-b39b-a79f8347c55c/5233981721.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_off0000eea9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEA9 5456 bytes
SHA-256: a666a5b6bc00e66e677ad5aab89e394e77b074ff1c1a99edee4e1d0312777d4f
font_01_sfnt_off00010160.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10160 10664 bytes
SHA-256: 96362994a917640bbba9eefe8d1a4b997cd33db4590c85ff3be97120fb85be4a