Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b768b611742d1af…

MALICIOUS

PDF

79.2 KB Created: 2021-03-23 05:08:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: d21a1e01ffeeb4591e113a5da5ffcc60 SHA-1: a941affba6f80e28ad1875d9be0a6c226334a367 SHA-256: 1b768b611742d1af0cf72d6a79bfb451610fe73b333ee8e76762b009098e5521
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are to suspicious domains, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external links point towards a malicious document, likely used as a lure to direct users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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://jottigo.ru/award?keyword=environmental+impact+assessment+project+report+pdf PDF link annotation
    • https://cdn.sqhk.co/putizimetiwe/eshcgiW/gunship_iii_us_navy_download.pdfIn PDF document text
    • https://gavemipaxok.weebly.com/uploads/1/3/2/6/132680822/viguxagajonuvilojidi.pdfIn PDF document text
    • https://cdn.sqhk.co/sadirorig/BMiehbv/32080477260.pdfIn PDF document text
    • https://cdn.sqhk.co/zejejofe/M9R8jaV/easy_cupcake_recipes_with_box_cake_mix.pdfIn PDF document text
    • https://cdn.sqhk.co/potexunajo/ajjjegf/anger_of_stick_4_hack_android_1.pdfIn PDF document text
    • https://cdn.sqhk.co/rikopekela/Hgcgggj/japofasobab.pdfIn PDF document text
    • https://tosixugiza.weebly.com/uploads/1/3/6/0/136052785/wikawuvewix-zorowupu-fofunam.pdfIn PDF document text
    • https://bogixeguwumuzu.weebly.com/uploads/1/3/4/5/134503630/gavidijizalajinuzim.pdfIn PDF document text
    • https://cdn.sqhk.co/timadupak/dP30hcU/livewapiguziritowewunare.pdfIn PDF document text
    • https://cdn.sqhk.co/bisuligiga/ic70oje/funny_orange_cat_pictures.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/86467fae-58cb-49b8-88e6-2805494d9ee4/how_to_fix_clogged_printer_nozzle.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f1bfadc5-6900-46c9-9bc0-9f9c258e60ec/sinivejov.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8ead7ea0-cc9d-4caf-a3dd-d58af7b432a9/problemas_porcentajes_encadenados_3o_eso.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/44542420-a1ef-464b-a89b-2bceb495f90e/rikagerukumi.pdfIn PDF document text
    • http://xedekig.rf.gd/67094222918.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b0666158-6d46-4a8a-9bec-b39e79901c0f/panevuwodevuzerovowadajif.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6063f575-a16a-420b-a5bb-56c35835ff1d/do_i_need_microsoft_asp.net_mvc_4_runtime.pdfIn PDF document text
    • http://sewewixa.epizy.com/85397756109.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/64c71ed2-227e-4c30-ba84-36cb9a980036/80323304059.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/190b4dd5-428b-4507-b2fc-8aef2ad4d0d0/pepemabevidu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ea280844-7a5d-4400-8062-fc4ef818acf4/kusex.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_off0000f29d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF29D 5392 bytes
SHA-256: 43249b6533d9111d45ffa5084603bcc2bceb7fe8c18e000a07ed4a8dbc8e3528
font_01_sfnt_off000104e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104E7 13060 bytes
SHA-256: 472828c9242c42e7b7ca95a2252fc1ec48ae1d70420f0a1518b0ff02f8ad1978

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