Malicious PDF — malware analysis report

Static analysis result for SHA-256 6deb6244fffb38aa…

MALICIOUS

PDF

107.2 KB Created: 2021-02-20 15:36:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: b5f1c5ce837f0fa1eada39c0c6cc3879 SHA-1: 644f9eba98a8ef09e02d09ddc7f96892d21c8987 SHA-256: 6deb6244fffb38aac4d575957326a58e1554fdd1133f3d0a5fa250001ca41465
126 Risk Score

Malware Insights

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

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URLs, many of which are hosted on disposable domains, suggesting a link farm or phishing lure. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating the PDF is designed to redirect users to multiple external sites. No scripts were extracted, but the overall structure and URL patterns point towards a phishing or malware distribution campaign.

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://bologen.ru/123?utm_term=will+cyberpunk+2077+be+censored+on+ps4 PDF link annotation
    • http://harkateine.fun/togewevo0ifvh.pdfIn PDF document text
    • http://pogadai.xyz/donjoy_shoulder_stabilizer_brace_instructionstiirb.pdfIn PDF document text
    • https://cdn.sqhk.co/xubipoxeguza/eWVjihi/battle_for_the_galaxy_mod_apk_android_1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366668/normal_5fd67947dedaf.pdfIn PDF document text
    • https://cdn.sqhk.co/wevubuse/3hbMcie/gezobofopewudubag.pdfIn PDF document text
    • http://afracheat8.xyz/75186989715ost5n.pdfIn PDF document text
    • http://hookup666.site/flowers_dictionary_malayalamz7mpy.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382948/normal_5feaf87ad8337.pdfIn PDF document text
    • https://cdn.sqhk.co/letiludixo/bAgeyjj/flip_surfing_colors_online.pdfIn PDF document text
    • http://republvinb.fun/kumubijepunigiljr1vk.pdfIn PDF document text
    • http://potolkilife.ru/84407717395cqvyz.pdfIn PDF document text
    • https://cdn.sqhk.co/galudubujuwa/fhgmgiV/automatic_reply_outlook_2016_missing.pdfIn PDF document text
    • http://sokolov.fun/react_website_templates_free_github64r1a.pdfIn PDF document text
    • https://cdn.sqhk.co/zasemewiti/LzfTido/bodafegimo.pdfIn PDF document text
    • https://cdn.sqhk.co/lodesejidi/P22yFic/craftsy_classes_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/sifajoxojif/gvigVjf/nofafirutivuxoxubudi.pdfIn PDF document text
    • https://cdn.sqhk.co/foxidagon/EkieCia/xigepe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/gowupuzokowuxes/brother_label_maker_manual_pt-_65.pdfIn PDF document text
    • https://s3.amazonaws.com/rovuweraja/belvedere_british_school_uniform.pdfIn PDF document text
    • https://s3.amazonaws.com/nuxepiduded/mindfulness_colouring_sheets_animals.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_off00016674.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16674 5616 bytes
SHA-256: a9fb36d04d4e472d79c9302f7e5faef1a0523e12254e8f693323ab9fc7a7db12
font_01_sfnt_off000179bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x179BF 10892 bytes
SHA-256: 05026a47b86f4a34675acc9988eca1d46160c9635c6d861d8592246dec50a0a9

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