Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca8d48f68ae26867…

MALICIOUS

PDF

93.7 KB Created: 2021-06-01 02:04:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 76c909e5d740b386f179dc96eb1a1bf0 SHA-1: e27c6392bbf162b3973270abaf02806b94736823 SHA-256: ca8d48f68ae26867f47421222a40523b0bef37fe09af8f22daa96d6266707142
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains a large number of external links, suggesting a link farm or phishing attempt. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://irlanc.ru/pbw?utm_term=how+hard+is+the+padi+open+water+test
    • https://posapana.weebly.com/uploads/1/3/1/4/131454172/badajikogekuzawowom.pdf
    • https://varivupe.weebly.com/uploads/1/3/4/4/134480773/farivixumagu_wugokijofuru.pdf
    • https://vatipasa.weebly.com/uploads/1/3/0/7/130775610/1816403.pdf
    • https://fezivalolir.weebly.com/uploads/1/3/4/4/134461714/zuvigapel.pdf
    • https://vadunidiv.weebly.com/uploads/1/3/4/4/134464125/nudok.pdf
    • https://libizegenumejav.weebly.com/uploads/1/3/0/7/130775388/sakiduxaporotemavo.pdf
    • https://nakosedamewa.weebly.com/uploads/1/3/4/6/134612328/fotewef-xoxubedevebepi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/51d7302a-f006-472e-8045-92ad1175fa03/ihip_bluetooth_headphones_charging_time.pdf
    • http://niwomif.pbworks.com/f/josapawokemiw.pdf
    • http://zikupuzajix.pbworks.com/f/2020_my_country_hack_version_download.pdf
    • http://zufumegi.pbworks.com/f/vygotsky_theory_of_cognitive_development.pdf
    • https://uploads.strikinglycdn.com/files/26428ab7-bca0-45ab-9299-98566039ade9/macbeth_free_online_movie.pdf
    • http://wuvebag.pbworks.com/f/wijujagiwisegakoninowekit.pdf
    • http://magogopowo.pbworks.com/f/is_dish_network_good_for_gaming.pdf
    • https://uploads.strikinglycdn.com/files/6d0f4df9-c483-46f8-a61a-b6e7ac681cf7/73607593005.pdf
    • https://uploads.strikinglycdn.com/files/2919a696-e182-4456-89ee-ffc3f46043f2/6240825921.pdf
    • http://mifimoruzuwo.pbworks.com/w/file/fetch/144431385/55241084452.pdf
    • http://ruwezebom.pbworks.com/f/best_pellets_for_crosman_760.pdf
    • https://uploads.strikinglycdn.com/files/02c0f495-9643-474e-9c09-348787d7399a/how_to_use_self_timer_nikon_d3400.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013227.bin
a977e5603ccafbc2a8d1ff5cbdae087f03407048a3b169397a457ad3cb893045		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13227 5068 bytes
font_01_sfnt_off0001436b.bin
4a847247c9de0095bfc2e688dcdb62d5ceb85bb3cd3929817289830e81e6b93a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1436B 11160 bytes

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