Malicious PDF — malware analysis report

Static analysis result for SHA-256 72d6228a3c000653…

MALICIOUS

PDF

81.4 KB Created: 2021-02-20 15:57:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 56afa98b1ed61c9438f78b116b951093 SHA-1: 4d0f85de505330fde6582feea89fd3414545607d SHA-256: 72d6228a3c00065362b71cf6b559026d28363e0de9d14b7d66d9a3556a6e54f1
126 Risk Score

Malware Insights

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

The PDF file contains multiple embedded URLs, with a primary focus on directing users to 'baarspo.ru' and 'cdn.sqhk.co'. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for link farms, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or credential harvesting.

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://baarspo.ru/wix?keyword=classifying+chemical+equations+worksheet+answers PDF link annotation
    • https://cdn.sqhk.co/wevafofed/gjbEiet/23764054264.pdfIn PDF document text
    • http://lekezoreg.22web.org/88961350548.pdfIn PDF document text
    • http://xugafigipi.22web.org/22089843871.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367005/normal_5ff2a47776653.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495039/normal_5fe3e4df4ba17.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410027/normal_5ffe9bcbdc93f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467979/normal_6016d9e171f54.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rupufunolodul.rf.gd/beating_heart_song_free.pdfIn PDF document text
    • http://mepogevotu.epizy.com/probability_density_function_normal_distribution.pdfIn PDF document text
    • https://s3.amazonaws.com/fonibinaraj/birthday_background_images_hd_1080p_free.pdfIn PDF document text
    • http://luzirilokupozar.rf.gd/oster_hand_blender_target.pdfIn PDF document text
    • http://nunevenesaxo.rf.gd/maps_for_minecraft_bedrock_edition.pdfIn PDF document text
    • http://lidesesepaz.rf.gd/magero.pdfIn PDF document text
    • https://s3.amazonaws.com/vovabagubajegeb/anxit_de_performance_au_lit.pdfIn PDF document text
    • http://suwulinivez.rf.gd/adobe_photoshop_express_apk_mirror.pdfIn PDF document text
    • https://s3.amazonaws.com/leributafa/wuxibobevar.pdfIn PDF document text
    • http://pejigevug.rf.gd/vefebilinokedopetekiji.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_off00010025.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10025 5584 bytes
SHA-256: cfc02da53e4a0722a0a4e9e061f3d2355b16a0a08c65a26080af115961247fb8
font_01_sfnt_off0001130d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1130D 10788 bytes
SHA-256: 901452cf1bfc974b324aa95abbdf0ca1a751ab8462214e91d151c0639f900a23

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