Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba956dd12b5959ef…

MALICIOUS

PDF

72.5 KB Created: 2021-02-27 21:56:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 2d5107bb6036e31ecf78ade96c112b0a SHA-1: a322f557c20c3643cd8871e649d54e69cf040292 SHA-256: ba956dd12b5959efa4ba8e89e568b41572275dcc3ddd14b173122a5bcad9f36b
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many pointing to disposable domains, and is flagged by ClamAV as a phishing trojan. The document body, though heavily obfuscated, suggests a lure related to educational worksheets. The presence of multiple external URIs and the ML classifier's high confidence score indicate a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://nipisod.ru/wix?keyword=the+quadratic+formula+and+the+discriminant+worksheet+5-6+answers PDF link annotation
    • http://uablog.website/64858015913c1d7f.pdfIn PDF document text
    • https://vexinafofonazes.weebly.com/uploads/1/3/1/8/131871992/fc2e228058e6.pdfIn PDF document text
    • http://sewalenugebob.iblogger.org/moxedewamowiwoxodumakapu.pdfIn PDF document text
    • https://baxomowimesadud.weebly.com/uploads/1/3/5/3/135303612/9712042.pdfIn PDF document text
    • http://nageramuvepom.mywebcommunity.org/sole_fitness_e35_elliptical_machine_sale.pdfIn PDF document text
    • http://xoziduso.mypressonline.com/latawukefisewi.pdfIn PDF document text
    • https://cdn.sqhk.co/nupegefozub/iajgjbn/15851209276.pdfIn PDF document text
    • http://lewulumotuf.iblogger.org/dota_auto_chess_mage_guide.pdfIn PDF document text
    • http://libertinemodels.com/6263400594yrpt4.pdfIn PDF document text
    • http://lisipezasuk.iblogger.org/juponumimuxogose.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://kenefokugoxetu.rf.gd/nubodoze.pdfIn PDF document text
    • http://kupemamenigasi.rf.gd/statement_addressing_key_selection_criteria_template.pdfIn PDF document text
    • http://kakasis.onlinewebshop.net/70408957854.pdfIn PDF document text
    • http://gixarewujedel.atwebpages.com/nibojo.pdfIn PDF document text
    • http://kipadixot.rf.gd/46345340626.pdfIn PDF document text
    • http://dilowopuvuzi.rf.gd/avast_antivirus_software_for_windows_7.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cf01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF01 5684 bytes
SHA-256: b62b0c7baf6687a8526442af037c0b7c12d6ccf2aea0baee0420024d2edbd034
font_01_sfnt_off0000e24e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE24E 10456 bytes
SHA-256: 453297d7a9a38237e0d4df3665b622c710d5264489760d58860369f049064561
font_02_sfnt_off00010629.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10629 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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