Malicious PDF — malware analysis report

Static analysis result for SHA-256 8650f39f2ce22ce9…

MALICIOUS

PDF

75.4 KB Created: 2021-04-29 02:06:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: ab8100011f1d2c0cd8efc521a9e0c64e SHA-1: 47a287c44ce523550b28e869e13906c826dcc99b SHA-256: 8650f39f2ce22ce96890202b0ec1814ef48cdba708ccd017b3dadb8908ee41a3
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one prominent URL identified as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect the user to malicious content.

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://jumiwimov.ru/strik?utm_term=educational+psychology+phd+uk PDF link annotation
    • https://nifixivenugoku.weebly.com/uploads/1/3/1/8/131856212/denakufifuv.pdfIn PDF document text
    • https://cdn.sqhk.co/sizafutito/6ijEjjW/python_xml_formatter.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451551/normal_6064151923454.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464056/normal_5fdc46c7e26b0.pdfIn PDF document text
    • https://nabumeludofava.weebly.com/uploads/1/3/4/3/134373896/db559cb3982.pdfIn PDF document text
    • https://migerele.weebly.com/uploads/1/3/1/4/131453560/tewabofifijexe.pdfIn PDF document text
    • https://cdn.sqhk.co/tixuniwe/aghsQly/lopisesawisaturatovut.pdfIn PDF document text
    • https://cdn.sqhk.co/vikimono/gegjidJ/rio_las_vegas_tournament_schedule.pdfIn PDF document text
    • https://zonisobeb.weebly.com/uploads/1/3/4/3/134333784/pagavonoxo_jadejitowi.pdfIn PDF document text
    • https://zadoloxo.weebly.com/uploads/1/3/4/6/134602956/77fa3b5052f.pdfIn PDF document text
    • https://cdn.sqhk.co/jarixizotib/hdUMJjc/mirror_cakes_near_me.pdfIn PDF document text
    • https://boxorefo.weebly.com/uploads/1/3/0/9/130969922/5540884.pdfIn PDF document text
    • https://cdn.sqhk.co/nutanujel/cZAjeVD/yoga_funny_trending_memes_jokes_comedy_videos_youtube.pdfIn PDF document text
    • https://cdn.sqhk.co/dibitarebizu/qORijia/pumpkin_carving_simulator.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414352/normal_5fec67813746d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382773/normal_604cb45c438fe.pdfIn PDF document text
    • https://cdn.sqhk.co/xalibolopov/gjVhbid/amplified_bible_free_for_android_tablet.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://dbb1fad9-9c05-458f-9e32-bc0b7f65d7ec.filesusr.com/ugd/451461_2a64ee27cf1b40db9226570a11621c5e.pdf?index=trueIn PDF document text
    • https://73f4d879-981c-49fe-abc7-520f36a14a84.filesusr.com/ugd/b77b08_2efa0d6d90604098964d8b3ccb77b618.pdf?index=trueIn PDF document text
    • https://c0cead0d-5248-483d-940e-95cc3acd9bde.filesusr.com/ugd/20d83a_edb51cee3d724a3f9ad0e6b3bd050a22.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_off0000e946.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE946 5364 bytes
SHA-256: 61fcad313790143fbe5edf9660907b9a679d6a3ecc84c459f6cf88adcd8d3bea
font_01_sfnt_off0000fb8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB8E 10884 bytes
SHA-256: eb30c5abf6e10c35e80b346d1c77e3ca3f5561ce23381c225ae060f7e240a954

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