Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfa7683653f24b4c…

MALICIOUS

PDF

80.5 KB Created: 2021-03-31 02:24:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 831ebba622122f3a38f02b844721bebe SHA-1: 1dfce186702509ec3b7193087d28033044b22e19 SHA-256: dfa7683653f24b4c0c95120b67df1aa74f0c86f26bd75ffcb1ee6b8a0e0add99
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous external URLs, many hosted on disposable domains, suggesting a link farm or phishing lure. The presence of embedded JavaScript, though not explicitly detailed, is a common vector for exploiting PDF vulnerabilities or redirecting users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://zajinet.ru/123?utm_term=garmin+vivomove+hr+size+guide PDF link annotation
    • http://welitizenowem.mywebcommunity.org/rexeratagobowiruxi.pdfIn PDF document text
    • https://tiwamufeg.weebly.com/uploads/1/3/1/8/131871705/vanavumilosowi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464065/normal_60327bec223e7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373522/normal_601f6487931a2.pdfIn PDF document text
    • http://tamogulaganero.scienceontheweb.net/digital_electronics_projects_for_engineering_students.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404297/normal_5fff12d77e777.pdfIn PDF document text
    • http://nogefoxezegu.22web.org/nutopatijedu.pdfIn PDF document text
    • http://fitixezuveseli.22web.org/42830096840.pdfIn PDF document text
    • http://nepoxiduvilej.scienceontheweb.net/bipedismo_en_la_evolucion_humana.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444866/normal_6045480a355da.pdfIn PDF document text
    • https://zupavuzinopaz.weebly.com/uploads/1/3/4/2/134265708/norukebajafi-rafilewela-verijiseku.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376105/normal_603f004da345d.pdfIn PDF document text
    • https://monokuzofo.weebly.com/uploads/1/3/2/7/132741222/824d0442.pdfIn PDF document text
    • http://tiluvopira.medianewsonline.com/basic_english_grammar_with_tamil_meaning.pdfIn PDF document text
    • http://suraneb.scienceontheweb.net/lusajibexi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://2b08c346-38d8-4763-b559-bb9d4fff2313.filesusr.com/ugd/40c9d6_9a396de80e324f87b6105266660d489f.pdf?index=trueIn PDF document text
    • http://sefeluxezilire.epizy.com/comment_fusionner_plusieurs_document_en_un_seul.pdfIn PDF document text
    • http://kakoxoduruze.epizy.com/bus_simulator_indonesia_pc_game_free_download_windows_10.pdfIn PDF document text
    • http://mezizafija.rf.gd/43212112508.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b1598c77-8b40-4b9d-9a76-2cf3de3d8767/xosuzuw.pdfIn PDF document text
    • https://f1cb2ec4-a82d-4768-8a06-5236a2db220e.filesusr.com/ugd/a2e20a_3ef3ea41825c4a1f81349a5fd5d5fa52.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e57b1ec0-6654-4984-b075-1f0c5303fef0/gotiromidizeba.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_off0000f9d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9D6 5348 bytes
SHA-256: df196c2e43cf284d9d9b0c1bab3c49e3c172eace349d3e15471ce2c6d3bde8e0
font_01_sfnt_off00010bea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BEA 12084 bytes
SHA-256: 002dec236b29fe7fece6b906d36d348be660102baf3c0b800f7af53a3238894e

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