Malicious PDF — malware analysis report

Static analysis result for SHA-256 d09b96ef2d8c5833…

MALICIOUS

PDF

88.7 KB Created: 2021-03-18 04:23:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: bdc53cba91f068771a42eed68973ded6 SHA-1: e66f4a4a2523bb2d45f14a305945a78fcc0cf2be SHA-256: d09b96ef2d8c5833810a569981618eb1e12d35eea11a81f8d33d2c008595a6a8
126 Risk Score

Malware Insights

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

The sample is a PDF file flagged by multiple heuristics, including ML and ClamAV, as malicious. It contains a large number of embedded URLs, many of which point to disposable domains or redirectors, indicating a phishing or malware distribution attempt. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically highlights the link farm nature of the document, suggesting an attempt to obscure malicious destinations.

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://druttle.ru/strik?utm_term=piano+teaching+methods+for+adults PDF link annotation
    • http://qqkaxes.xyz/99337004262thn3y.pdfIn PDF document text
    • http://sarhello.online/12071702152f8rea.pdfIn PDF document text
    • http://nubokokepiw.iblogger.org/sezoxoseragobekaxomogubuw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457296/normal_5fd2e56162e1a.pdfIn PDF document text
    • http://nefidale.22web.org/ergonomic_desk_set_up.pdfIn PDF document text
    • http://jesiwufap.iblogger.org/12846009810.pdfIn PDF document text
    • http://welifenepural.iblogger.org/87880585313.pdfIn PDF document text
    • http://hopecommunitynaz.com/my_hero_academia_magnemhvvm.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444657/normal_5ffbd5681f199.pdfIn PDF document text
    • http://bofesota.66ghz.com/messenger_app_apkmonk.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://winemuvigurema.rf.gd/borbaad_movie_song_ringtone.pdfIn PDF document text
    • https://s3.amazonaws.com/rokuwapesu/abn_form.pdfIn PDF document text
    • http://fusiditato.epizy.com/83307943290.pdfIn PDF document text
    • http://danijikuguwidak.rf.gd/ethical_hacker_course_in_pune.pdfIn PDF document text
    • http://lewuxaxuzodu.rf.gd/garmin_forerunner_405_wrist_strap_replacement.pdfIn PDF document text
    • https://s3.amazonaws.com/lezerawe/86471600350.pdfIn PDF document text
    • https://s3.amazonaws.com/mevuzokekenojab/2099762506.pdfIn PDF document text
    • https://s3.amazonaws.com/vapelurowar/chokoloskee_florida_fishing_report.pdfIn PDF document text
    • http://sugexure.rf.gd/mijebo.pdfIn PDF document text
    • http://xevibija.rf.gd/msc_mathematical_physics_books.pdfIn PDF document text
    • http://pinisexukatata.rf.gd/64546899765.pdfIn PDF document text
    • http://laganinol.rf.gd/52229094122.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_off00011d79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D79 5436 bytes
SHA-256: b85cf4f0e858f278aa461263f1d74fda4d9efc9c07e732b871bdd604709c5379
font_01_sfnt_off00012fcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FCD 10676 bytes
SHA-256: 39905c03029c3a5fb93f1a8df98bb048e6de76e361ec8287ed5d6d6321c509d5

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