Malicious PDF — malware analysis report

Static analysis result for SHA-256 816cf156ff552925…

MALICIOUS

PDF

71.2 KB Created: 2021-02-18 07:26:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: b9ae891ba186006b9a9941d3e09e0c68 SHA-1: f58f2431fdb1af151a168ff992258235295c12b6 SHA-256: 816cf156ff5529251b6e3af378508526a7de445f0ecf0dce9d1ddf025d0648ae
126 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which point to disposable hosting and are designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded URLs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggest the document is part of a link farm designed to trick users into visiting malicious sites.

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://druttle.ru/123?utm_term=what+type+of+text+is+a+recipe+book PDF link annotation
    • http://teenagetutor.online/old_congo_music8kh0o.pdfIn PDF document text
    • http://djami.ru/dobabuzuwuvozupu6h5lp.pdfIn PDF document text
    • http://gijofabenetawix.66ghz.com/invisible_man_by_ralph_ellison_sparknotes.pdfIn PDF document text
    • http://zzzmmmmejjj.space/apc_smart-_ups_rt_1000va_230v_datasheetjjypm.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379837/normal_600f2dbc78ba6.pdfIn PDF document text
    • http://topsale.pro/davidson_internal_medicine_cases3rnq3.pdfIn PDF document text
    • http://ipai.online/2018_indesign_calendar_template_freepn3ep.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4491398/normal_5fe5296c6b928.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454821/normal_5fd279e096237.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485568/normal_5fc749da3e3ff.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465270/normal_5fd13d49f40c8.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/subopukomanaw/visuvasefuvoluvamokokuxab.pdfIn PDF document text
    • https://s3.amazonaws.com/rutufokedizon/elapsed_time_worksheets_excel.pdfIn PDF document text
    • http://xilavugepiw.rf.gd/ipcc_report_2019_cryosphere.pdfIn PDF document text
    • https://s3.amazonaws.com/fizaxo/picsart_software_for_windows_10.pdfIn PDF document text
    • https://s3.amazonaws.com/tufujifinobiro/88353698499.pdfIn PDF document text
    • https://s3.amazonaws.com/jenagubadopi/ingeniera_de_tecnologas_de_la_informacin_espe.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_off0000d804.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD804 5456 bytes
SHA-256: 124755e27338c985aa152dd85ca13d4dfb5f1103e058b3b9b2c8ee6f9a84e85c
font_01_sfnt_off0000eaaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAAA 10436 bytes
SHA-256: 707a1b20344c1d2851479680d62ca62d6f6a3c2cba0cfcd1a52c05cdc1ea1a46

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