Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8f830418008bc7b…

MALICIOUS

PDF

78.6 KB Created: 2021-02-24 20:52:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 23ac4baba28400d060ac660aedb02066 SHA-1: 64428e321b87dc719ff610888fc762585cd73a4d SHA-256: f8f830418008bc7bd548e47c8dd67d5109ea3ed9366f41309be8c07894ba5611
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a high ML score and ClamAV detection as a phishing trojan. The embedded URLs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicate a strong attempt to redirect users to potentially malicious external sites. While no scripts were explicitly extracted, the nature of the PDF and the presence of external links suggest it may leverage embedded JavaScript for malicious redirection or exploitation.

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://bologen.ru/strik?utm_term=taotao+50+scooter+parts PDF link annotation
    • https://pinafizupefed.weebly.com/uploads/1/3/1/3/131380591/4476901.pdfIn PDF document text
    • http://fortuneo-enligne.com/distributive_law_worksheet_year_7xyssp.pdfIn PDF document text
    • http://fozovozazu.iblogger.org/gamejoropekawawelilonut.pdfIn PDF document text
    • https://lovapunosarimol.weebly.com/uploads/1/3/5/4/135401421/purepani-meforudigemok-seruja-vagunowi.pdfIn PDF document text
    • https://revafabeku.weebly.com/uploads/1/3/4/7/134708131/8612729.pdfIn PDF document text
    • https://pukakiliratof.weebly.com/uploads/1/3/4/7/134768090/64a42.pdfIn PDF document text
    • http://podarokinsta.online/quicksand_nella_larsen1h1fc.pdfIn PDF document text
    • http://lifeshop.pro/73075264851yxkuq.pdfIn PDF document text
    • http://lavka-karamel.ru/campaign_strategymi6a4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386613/normal_600c870f2bd35.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/tinezedu/zovuvafovaneremofixiz.pdfIn PDF document text
    • http://fonaxipovun.epizy.com/bryson_tiller_album_2018_zip.pdfIn PDF document text
    • http://gunubepixel.epizy.com/37795911043.pdfIn PDF document text
    • http://muxomak.epizy.com/quadratic_equation_graphing_problems.pdfIn PDF document text
    • http://jekewakus.epizy.com/45461806179.pdfIn PDF document text
    • https://s3.amazonaws.com/latufenaw/can_i_netflix_to_apple_tv.pdfIn PDF document text
    • https://s3.amazonaws.com/farefasejikap/29714757751.pdfIn PDF document text
    • https://s3.amazonaws.com/luxaduzimase/circular_std_font_free.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_off0000f992.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF992 5108 bytes
SHA-256: 292cb33612e34295683f65c6dbdde342c94eddb0f951a7472abd1a58c54fb1f7
font_01_sfnt_off00010b02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B02 9988 bytes
SHA-256: eaabb9ba0260aa2f1797864d8c42d347efd37ea2dd59a866be68362a4d70f9a5

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