Malicious PDF — malware analysis report

Static analysis result for SHA-256 3690dcb7aae84b93…

MALICIOUS

PDF

78.9 KB Created: 2021-04-03 20:24:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 12212806175225451916d882b04437e4 SHA-1: 0526f8d6d707064aaa4e9edc7702c99b12ffc4ff SHA-256: 3690dcb7aae84b939ea1a361517f9db3d9d36d4bc3d7abdbcd7aff06c7b98bae
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a PDF SEO link farm, with the primary goal of directing users to potentially malicious websites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the embedded URLs are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • 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/123?utm_term=aoe+online+tren+garena PDF link annotation
    • https://cdn.sqhk.co/jenojigise/gchaicw/war_khalid_theme_instrumental_ringtone_download.pdfIn PDF document text
    • https://cdn.sqhk.co/voxedijudibo/aRhigia/bullet_time_bounce_botw.pdfIn PDF document text
    • https://cdn.sqhk.co/dudugetogi/zhfVgjA/ez4ence_piano_sheet_music.pdfIn PDF document text
    • https://cdn.sqhk.co/kizajituxab/hjji2wL/xanoduf.pdfIn PDF document text
    • https://cdn.sqhk.co/natefisaka/ggn9hdf/vikings_football_team_symbol.pdfIn PDF document text
    • https://cdn.sqhk.co/runenuti/hgdgd3I/download_auto_keyboard_for_roblox.pdfIn PDF document text
    • https://cdn.sqhk.co/vanewano/gJ4hhao/pofifebizop.pdfIn PDF document text
    • https://cdn.sqhk.co/baxijaxazixi/ilYhhYR/67789462438.pdfIn PDF document text
    • https://cdn.sqhk.co/dudugetogi/Ojf4r3U/savuzi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://849bdae7-2456-4570-9e2a-fc769e7e49ad.filesusr.com/ugd/2074c9_f93bb7d81d73498280ab9165494402d4.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6b4ae791-142b-4756-bfa9-8d18d9acc7de/is_there_going_to_be_a_season_two_of_nancy_drew.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e61a43b-5c61-4ea2-96b6-4d3e4dcb6e61/gagolomujotisok.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5278d763-6107-40e8-b15a-1ff492cb5cf8/kenmore_progressive_upright_vacuum_model_116_owners_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e30e5357-e7ea-4913-8947-6be9ef41dc9f/resumen_de_libro_para_leer_el_pato_donald.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b5b3f978-58f6-4adf-a0cd-fa12038ebbac/36110155713.pdfIn PDF document text
    • https://59b17237-83b3-47c6-9d40-f547da5b0434.filesusr.com/ugd/827194_a9fd9b022dfe46ea9033220ce203c9ba.pdf?index=trueIn PDF document text
    • https://ac685e6e-6442-44c0-91a1-b3a367e79ef2.filesusr.com/ugd/ce77c6_dc51436e3a7c42f68b363bb7769222a3.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/419c3b5c-5f13-4a0a-8b90-15b100e7ab99/que_es_la_linea_de_productos_de_una_empresa.pdfIn PDF document text
    • https://8dfd47f4-e591-4377-92a3-bdbf91d41e5a.filesusr.com/ugd/a58b01_5f201ddfb1314006ad006f587524dd67.pdf?index=trueIn PDF document text
    • https://be08d7d4-326a-4801-be9d-4496af17a43b.filesusr.com/ugd/d31907_db07f757b9514f46981dcbd294fb3b79.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1126f137-bdc4-4330-abbd-b568ae41cf3c/oracle_sql_select_date_ignore_time.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_off0000ebbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBBE 4664 bytes
SHA-256: 51c61d24a2efa588c6e84ef418c51e24d72723da8542d61fd867d228d4463532
font_01_sfnt_off0000fbaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBAA 22068 bytes
SHA-256: a5b91d12a73a120622697ad17448911e78aa28b0bde064268ad98f2c1b98595f

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