Malicious PDF — malware analysis report

Static analysis result for SHA-256 e825823b4f1e90bf…

MALICIOUS

PDF

75.8 KB Created: 2021-03-06 14:32:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 548ae2e327b201ef329511054201ac68 SHA-1: e114a25bc9ced9dff9855f41ef1828d31e25eda4 SHA-256: e825823b4f1e90bf22e74351d45b3916ed738e13ce13fd9b64bff8845e0cfcad
126 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicate a high probability of maliciousness. It contains numerous embedded URLs pointing to external domains, with several identified as link farms on disposable hosting. The primary purpose appears to be redirecting users to potentially malicious websites, as indicated by the PDF_SEO_DISPOSABLE_LINK_FARM heuristic and the presence of multiple unknown reputation URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://dugedepap.ru/wix?keyword=matter+elements+molecules+and+compounds+worksheet+answers PDF link annotation
    • http://aycotoro0.xyz/407670143625dw4a.pdfIn PDF document text
    • https://kanogerigan.weebly.com/uploads/1/3/4/6/134657300/zotudaxam.pdfIn PDF document text
    • http://gilumesu.mypressonline.com/rests_four-component_model_of_ethical_decision_making.pdfIn PDF document text
    • http://supermagazforsale1.xyz/tomevonyicny.pdfIn PDF document text
    • https://gixatupugibezi.weebly.com/uploads/1/3/5/2/135296842/d59a14f30299.pdfIn PDF document text
    • https://vumetubav.weebly.com/uploads/1/3/0/7/130776444/dozajofavodafimewam.pdfIn PDF document text
    • http://spainsale.pro/optical_illusion_art_easyqhob5.pdfIn PDF document text
    • https://cdn.sqhk.co/muzedikerum/khcAidK/dubofozonojominitipekex.pdfIn PDF document text
    • https://cdn.sqhk.co/jesotipo/gfUgcgg/solve_word_search_puzzles_online_free.pdfIn PDF document text
    • http://fukuzowi.sportsontheweb.net/cisco_sg200-50_console_port.pdfIn PDF document text
    • http://kihepc.xyz/370681663541v1px.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/a4110a25-c2f9-4504-997a-70f669dea0ce/how_do_i_put_pictures_in_an_album_on_my_iphone.pdfIn PDF document text
    • https://s3.amazonaws.com/xilasisefi/risuvakibugufake.pdfIn PDF document text
    • https://s3.amazonaws.com/tojabixefova/balak_nath_film.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/afbe5b24-1762-477b-b550-c65cf1ab240a/organizational_structure_chart_template_excel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/76b466ea-160a-4a1a-a98a-68e3ee9ef88c/xabujuzojepobeka.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8481cabf-628c-4a4a-b6e0-bf480ea29e02/cuantos_metros_cuadrados_hay_en_una_manzana_de_tierra.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_off0000eb92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB92 5472 bytes
SHA-256: 45a1a9576944b2c6e7b99bbfec2db8e5ff48fb94ee894c703fc5858eb534158f
font_01_sfnt_off0000fe20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE20 10340 bytes
SHA-256: 9cd1a2b1a4b9c2ab5a46357cc819368680e4137fe63536dca391571934c8f0d9

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