Malicious PDF — malware analysis report

Static analysis result for SHA-256 42a3f4768bfe4dd2…

MALICIOUS

PDF

85.2 KB Created: 2021-03-29 21:45:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 7f7d9dd84df60c631fd5943d9892484b SHA-1: 90d4d21d40103339775d62650f28359ca40aa430 SHA-256: 42a3f4768bfe4dd2e4adeecee23be2ab1a410a3fd0c105c21624f3b870efe47f
186 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which point to disposable hosting services, indicating a link farm designed to redirect users. The presence of a specific search query in one of the URLs suggests a phishing or content-luring attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • 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.
  • 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://jottigo.ru/strik?utm_term=what+supplies+do+i+need+to+make+stickers+with+my+cricut PDF link annotation
    • https://cdn.sqhk.co/gizetinediz/gjfgdgu/vubijevamikatagakamijewos.pdfIn PDF document text
    • https://cdn.sqhk.co/lidesoxu/22mBNge/kadokaretax.pdfIn PDF document text
    • https://mesowusiwa.weebly.com/uploads/1/3/5/9/135975120/9657295.pdfIn PDF document text
    • https://jegofedakosufe.weebly.com/uploads/1/3/5/3/135320490/5339220.pdfIn PDF document text
    • http://lukawumizoka.iblogger.org/soal_aritmatika_sosial_kelas_7_kurikulum_2020.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413578/normal_5ff49b9177b84.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408476/normal_605fbae99972a.pdfIn PDF document text
    • http://godotobekof.scienceontheweb.net/6124029529.pdfIn PDF document text
    • http://magexaxajatadog.getenjoyment.net/auld_lang_syne_sheet_music_piano.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448331/normal_5ff77b49cf84c.pdfIn PDF document text
    • https://venaresumizom.weebly.com/uploads/1/3/4/4/134468274/cc6cc06ee.pdfIn PDF document text
    • https://cdn.sqhk.co/xadakede/zRphjhx/95768455200.pdfIn PDF document text
    • https://foramawebor.weebly.com/uploads/1/3/1/4/131410370/e71114658f3.pdfIn PDF document text
    • https://leresidatebij.weebly.com/uploads/1/3/0/7/130776374/29ed416a.pdfIn PDF document text
    • http://rawiduti.medianewsonline.com/anatomy_and_physiology_of_the_heart_and_circulatory_system.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vemameb.epizy.com/how_to_thread_a_brother_se600_sewing_machine.pdfIn PDF document text
    • http://jofewizabo.rf.gd/lasileg.pdfIn PDF document text
    • http://badakun.rf.gd/73499555495.pdfIn PDF document text
    • https://c534e673-b245-4a6d-8787-855fe96db707.filesusr.com/ugd/e19215_71d657c3cc5f4470a36b6cc9fe04f216.pdf?index=trueIn PDF document text
    • https://1d812fcc-cfc3-4558-a870-56fc5b7f4c2e.filesusr.com/ugd/754d94_5c9a2e30a4ad4191bb725467074d078d.pdf?index=trueIn PDF document text
    • http://totaraxidob.rf.gd/edexcel_gcse_history_9-_1_revision_guide.pdfIn PDF document text
    • https://a909b8fe-7c6e-4467-a5b6-92e64a2a5b5d.filesusr.com/ugd/65efca_211c5a28221c49d3ad7ae3941df89207.pdf?index=trueIn PDF document text
    • https://cc4f1b1a-08c7-467e-bb5a-e3073ad8caf1.filesusr.com/ugd/ffc175_7f1ebb58ba814af5867b3e32583f96e8.pdf?index=trueIn PDF document text
    • https://510adc33-753b-44c0-977e-8d34da8fcdd4.filesusr.com/ugd/5f4192_f6c4946a43894d7fb8b383d560f33fb8.pdf?index=trueIn 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_off00010ca5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CA5 5584 bytes
SHA-256: 1da9c0c06b21de80cade9a02e63c050d71c0fa1480b3a9ad3e036dcb7d3c68bb
font_01_sfnt_off00011f95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F95 11484 bytes
SHA-256: 563bcb97e14d62ea1d1f5a8cdd7093ae7146686fb9fb46e266747233aec53ff3