Malicious PDF — malware analysis report

Static analysis result for SHA-256 0810bfcfbf1b5953…

MALICIOUS

PDF

83.0 KB Created: 2021-03-23 16:41:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 244fcb0aa67e4161b8a3168120b52070 SHA-1: 78ea1cf37152d622d41108d2f13b4aac8b9f4225 SHA-256: 0810bfcfbf1b59539303d0c4a217ecc006c849f48859b8ab42bf2506a0ee2e0b
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, a common tactic for phishing or distributing further malware. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to malicious sites, potentially for credential harvesting or to download additional payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://kuzutuzo.ru/strik?utm_term=beat+the+market+maker+pdf+download
    • https://cdn.sqhk.co/giganopof/c0fKjjl/lakidopemuwejibepip.pdf
    • https://xojunujad.weebly.com/uploads/1/3/1/1/131164104/90a72ae.pdf
    • https://cdn.sqhk.co/jogekiluse/aghjfgj/gafobenulegatuzujibi.pdf
    • https://cdn.sqhk.co/wajerewuwer/hheTgcw/33270896542.pdf
    • https://jufozawuvinuxak.weebly.com/uploads/1/3/5/3/135326647/2162de44a8e.pdf
    • https://cdn.sqhk.co/nezuxada/hhxiSib/35625434550.pdf
    • https://cdn.sqhk.co/xutazazo/iaOjjhe/teleport_definition_in_english_dictionary.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/160831e5-17a3-4fa1-98f5-f0248afadc1f/youre_gonna_lose_your_job_meme.pdf
    • https://s3.amazonaws.com/godoremitiwuja/best_soccer_camps_for_10_year_olds.pdf
    • https://uploads.strikinglycdn.com/files/c4e5e706-c0ac-406f-bf84-aca074a0e16f/poguvososujitas.pdf
    • https://s3.amazonaws.com/gifiz/difuraje.pdf
    • https://s3.amazonaws.com/tojazudibumogab/11546680034.pdf
    • https://uploads.strikinglycdn.com/files/7b120894-056f-4115-abe8-7c7b3dabb389/hilo_book_3_read_online_free.pdf
    • https://uploads.strikinglycdn.com/files/b7aa3fbe-6a40-4afd-9c60-172ca953fbef/judea_trembles_under_rome.pdf
    • https://s3.amazonaws.com/navoburarovada/zoology_subject_information.pdf
    • https://uploads.strikinglycdn.com/files/489693ef-4f7a-493b-9218-4e1ef3546274/tawejopikuliwagolibusuwog.pdf
    • https://s3.amazonaws.com/lixuduwonifa/ati_radeon_hd_4550_driver_free.pdf
    • https://s3.amazonaws.com/wupixufekijax/ultimate_combat_sse_vr.pdf
    • https://uploads.strikinglycdn.com/files/1f0792d1-0b56-4c63-9a98-a18baa6b6da3/24799688836.pdf
    • https://s3.amazonaws.com/rupatojuko/91299804792.pdf
    • https://uploads.strikinglycdn.com/files/73cfdeab-881e-4422-9ee2-d2fb7144f914/como_ser_un_lider_de_trabajo.pdf
    • https://s3.amazonaws.com/purawuma/77624765060.pdf
    • https://uploads.strikinglycdn.com/files/e498a68b-49c3-4b6e-af31-5ff6674ba4f6/how_to_become_a_criminal_justice_attorney.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_off00010530.bin
a184d383046a05d480e8c8919fd2d5fac1832d7998269f30200bedef35956cc4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10530 5308 bytes
font_01_sfnt_off00011729.bin
c472c6f5259da1de1d3e61e3bcf6541c7bb798e6f0c9405aafd7ffa685ec5efd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11729 11648 bytes

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