Malicious PDF — malware analysis report

Static analysis result for SHA-256 63fb48a58549f079…

MALICIOUS

PDF

77.4 KB Created: 2021-03-17 06:33:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: cac5edb534ebab866ce82115f91ee630 SHA-1: 521e36d98f98713624da9c5a510b723238c40d76 SHA-256: 63fb48a58549f079e3b0b9d7ef4e695892704e4fe217b1f5897dff17741f0e95
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are SEO-themed and point to other PDFs, suggesting a link farm or content-loading mechanism. One of the primary URLs, 'https://nipisod.ru/award?keyword=speech+therapy+for+stuttering+pdf', is likely a lure to a malicious site. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan.

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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/award?keyword=speech+therapy+for+stuttering+pdf PDF link annotation
    • http://russianstravel.ru/62116523545ry10f.pdfIn PDF document text
    • http://rafale.store/xivatovufijudubofunirek300po.pdfIn PDF document text
    • http://fortuneo.biz/why_is_the_orange_light_blinking_on_my_dell_laptoptzbih.pdfIn PDF document text
    • https://wunogalabapa.weebly.com/uploads/1/3/4/6/134603674/dapud.pdfIn PDF document text
    • https://wagetuve.weebly.com/uploads/1/3/5/3/135323282/6973422.pdfIn PDF document text
    • http://hotita.space/sheffield_children_s_hospital_emergency_department_guidelinesxbjq5.pdfIn PDF document text
    • http://kyhni.site/royal_family_members_institutionalizedk2fcx.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/napoledunadigo/53906663887.pdfIn PDF document text
    • https://s3.amazonaws.com/xakajoziwibi/strategy_game_android.pdfIn PDF document text
    • https://s3.amazonaws.com/lewuli/victory_energy_services_llc.pdfIn PDF document text
    • https://5ee0d2ad-6486-47ce-ab7d-0e7b2bae4193.filesusr.com/ugd/bc0d1e_fef2ebe5df3e48aba686367569db8cf8.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gapivegek/office_365_excel_tutorial.pdfIn PDF document text
    • https://s3.amazonaws.com/salosibejodod/20526601686.pdfIn PDF document text
    • https://c2093f15-f4fb-4bda-9582-db5404103fa6.filesusr.com/ugd/b28561_b41d8491399940c29c1d80fe138daa72.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nevowimo/what_does_sexually_active_mean_urban_dictionary.pdfIn PDF document text
    • https://6fd4412c-3e6e-4f21-a9af-8137ffc6c0d9.filesusr.com/ugd/03469c_e314bb03ec574ab0926930e2617d4869.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/buganabowumujef/80566549535.pdfIn PDF document text
    • https://s3.amazonaws.com/jixerubowi/chore_chart_template_google_docs.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_off0000ec71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC71 5592 bytes
SHA-256: 5580fdee3c6c8a32e9fa8fa73e416626bde2969648c2928e90ea0b5a1a3be910
font_01_sfnt_off0000ff7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF7C 11472 bytes
SHA-256: 5829b5b7dce54dee7006e2315f4f790498fb20b91abd4f02c275f16792a5443b

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