Malicious PDF — malware analysis report

Static analysis result for SHA-256 c03cd4b945f33860…

MALICIOUS

PDF

77.1 KB Created: 2021-04-01 03:44:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: c35fc374f6af9c5f489c67fc95aa0466 SHA-1: 5a67e1235de21bf1c698ab07f48105497138d7ef SHA-256: c03cd4b945f33860a1542f1e9c2f609c4117ee9d87e99da678b8a25dbad56313
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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://xezojetit.ru/award?keyword=free+printable+august+2020+calendar+pdf PDF link annotation
    • http://nuvagefo.medianewsonline.com/louise_hay_morning_meditation_affirmations.pdfIn PDF document text
    • https://cdn.sqhk.co/kivipemo/igjogi7/nixotaxap.pdfIn PDF document text
    • https://cdn.sqhk.co/xipitufekaru/jB5gqKb/13094234563.pdfIn PDF document text
    • http://vuwubuwo.22web.org/barrett_esophagus_pathology.pdfIn PDF document text
    • http://dodemul.mygamesonline.org/advanced_catia_v5_workbook.pdfIn PDF document text
    • http://neditaxuvim.getenjoyment.net/penegizadojeneg.pdfIn PDF document text
    • http://takovevagagiv.scienceontheweb.net/auditory_processing_disorder_and_dyslexia.pdfIn PDF document text
    • http://josumewemuzob.getenjoyment.net/63260429257.pdfIn PDF document text
    • https://cdn.sqhk.co/serodozire/chhhhgc/demon_slayer_sword_maker_face.pdfIn PDF document text
    • https://cdn.sqhk.co/mapuvokunoj/jiheGTo/easy_moist_vanilla_cake_recipe_with_oil.pdfIn PDF document text
    • http://vadosixajobirug.mygamesonline.org/23104992354.pdfIn PDF document text
    • http://duxinivodozular.mywebcommunity.org/57427212803.pdfIn PDF document text
    • http://lumufurisazela.mywebcommunity.org/yard_machines_132cc_20-inch_push_gas_lawn_mower.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://karadefega.epizy.com/ananias_y_safira.pdfIn PDF document text
    • http://vogojitipam.epizy.com/57855999794.pdfIn PDF document text
    • https://s3.amazonaws.com/mokuwanibof/ng_book_10.pdfIn PDF document text
    • https://s3.amazonaws.com/sebunuzu/zedobotukipu.pdfIn PDF document text
    • http://xepadegi.epizy.com/chronic_kidney_disease_guidelines_summary.pdfIn PDF document text
    • http://pemukusa.epizy.com/fausse_route_elisabeth_badinter.pdfIn PDF document text
    • http://pulejebolev.rf.gd/recommendation_letter_download.pdfIn PDF document text
    • https://s3.amazonaws.com/fowonaxul/ielts_academic_writing_task_1_vocabulary.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_off0000f074.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF074 5692 bytes
SHA-256: 0d4c303b13c966b7d4dbb24ab0b1ff374a00a8b69164e54f06211ea19e1ed35a
font_01_sfnt_off000103df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103DF 10280 bytes
SHA-256: dedad8dfe269384826e8c0b8611b879a66b353bc5f756588294f4432dfef2ff7

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