Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5efa600cd443fe5…

MALICIOUS

PDF

81.7 KB Created: 2021-04-25 18:10:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 5fd69385cab1a1354b55e9f2f41a6e92 SHA-1: 5c9ea283dd7150f9076ccd850227003517e9f2a9 SHA-256: f5efa600cd443fe541d46512bbaa494a84352ee8cd61997af07eba4fc3793b29
126 Risk Score

Malware Insights

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

The PDF document contains embedded URLs that lead to a website offering cracked software, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body, though heavily obfuscated, contains references to 'sketchup pro 2015 crack 32 bit' and 'wkhtmltopdf', reinforcing the lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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://jumiwimov.ru/strik?utm_term=sketchup+pro+2015+crack+32+bit PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4384483/normal_604b95a2b95dc.pdfIn PDF document text
    • https://motabuwupogofe.weebly.com/uploads/1/3/1/6/131607229/3819550.pdfIn PDF document text
    • http://autocredit.moscow/how_to_connect_turtle_beach_px5_to_xbox_oneausjc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4499999/normal_5ff21d77e5731.pdfIn PDF document text
    • http://rm-swis-mine.com/descargar_musica_de_toque_de_banderawfhd7.pdfIn PDF document text
    • http://nasty666.space/duwuxubedogixazubuw9j.pdfIn PDF document text
    • https://tobejisexin.weebly.com/uploads/1/3/1/4/131454505/ea169397835b8b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419642/normal_5fff75e821d4c.pdfIn PDF document text
    • https://cdn.sqhk.co/gowamojon/ig6sJeQ/vudafesuw.pdfIn PDF document text
    • https://cdn.sqhk.co/kuwusemob/hgjfEja/pdf_annotator_free_portable.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4461523/normal_5ffe65a289e9f.pdfIn PDF document text
    • https://gazuxupoje.weebly.com/uploads/1/3/4/1/134108966/1243254.pdfIn PDF document text
    • http://afterdealer.pro/the_little_prince_first_paragraphemslf.pdfIn PDF document text
    • http://study-english-05.site/funolazonozqbtrw.pdfIn PDF document text
    • http://zaxukifo.22web.org/reformas_borbonicas_sociales.pdfIn PDF document text
    • https://cdn.sqhk.co/pofakedajavo/gNkShcM/40783241401.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tegajapo.rf.gd/delivery_truck_simulator_pc_game.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/232cdd69-50f4-4f3b-bec5-2e127034bcb0/celebrate_recovery_step_study_requirements.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ed7dec2b-8646-4f62-b478-578d24699119/bugipifit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6f035e96-3d09-4981-8116-16b0c223be03/physics_solution_class_11_chapter_2.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_off0000f025.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF025 5732 bytes
SHA-256: da2b52bcbe4324fc214580fda7fab8c73a4dc9eaa8f579e129349212e83bcbdb
font_01_sfnt_off000103a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103A2 23688 bytes
SHA-256: dd7b5b447031377def4d513fcfc4139207fe3409126dbb41248710689612eb6c

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