Malicious PDF — malware analysis report

Static analysis result for SHA-256 bdb98d3e618b1c62…

MALICIOUS

PDF

79.7 KB Created: 2021-02-21 07:48:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 21b972f9692a3a503928e0ff692b7f36 SHA-1: e989ddb0b618401bcfed439d370718913ef1fc31 SHA-256: bdb98d3e618b1c623a8a53bb72804c59b3ae8a460b3aee9f2594f403af4e2777
134 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, with at least one pointing to a suspicious domain ('bologen.ru') that is likely part of a phishing or scam campaign. The presence of a 'link farm' heuristic further suggests malicious activity, as it indicates an attempt to distribute links across multiple disposable domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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=how+does+it+make+you+feel+when+i+say+the+word+moist PDF link annotation
    • https://fejilezujew.weebly.com/uploads/1/3/4/3/134340931/6729743.pdfIn PDF document text
    • http://tomorubi.22web.org/57520795502.pdfIn PDF document text
    • http://toselarasomax.iblogger.org/payroll_audit_procedures.pdfIn PDF document text
    • https://ranenowubugipo.weebly.com/uploads/1/3/4/0/134040983/1956d459.pdfIn PDF document text
    • http://varietystore.website/film_the_painted_bird_subtitle_indonesiaa4sxb.pdfIn PDF document text
    • http://lnstagramcopyrightcenter.com/jokoritjo9i.pdfIn PDF document text
    • http://golesaluwo.66ghz.com/36931956067.pdfIn PDF document text
    • http://chaptejvxz.fun/davuwy1ca5.pdfIn PDF document text
    • http://tuworiki.22web.org/36123152782.pdfIn PDF document text
    • http://pusokum.66ghz.com/5976025751.pdfIn PDF document text
    • http://sizegivip.22web.org/60416614667.pdfIn PDF document text
    • http://giveaway2020.info/davapumezopazepuln36yj.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410415/normal_5fcf5b055f55c.pdfIn PDF document text
    • https://sudikefasegez.weebly.com/uploads/1/3/1/0/131070357/517731.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jawamamabob.rf.gd/rationalising_surds_gcse_worksheet.pdfIn PDF document text
    • http://vobogiv.rf.gd/android_reply_to_iphone_group_text.pdfIn PDF document text
    • https://s3.amazonaws.com/makumapikeze/87269652052.pdfIn PDF document text
    • https://s3.amazonaws.com/xukanomarexumu/data_structure_and_algorithm_analysis.pdfIn PDF document text
    • https://s3.amazonaws.com/jolunenafobuw/mailchimp_template_dimensions.pdfIn PDF document text
    • http://mezuvisudaduvo.epizy.com/serusulatasagedeki.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_off0000fbc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBC4 5364 bytes
SHA-256: 462c45bcae47cc2c181e7b34c7bbe34923fcaa4e679f08259e493e45dc71bf24
font_01_sfnt_off00010ded.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DED 10300 bytes
SHA-256: dc1bb85491f039d9d7bc53769e7093d43ab2bd38b3a1359b3ce9e1f3fcb43fe5

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