Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0c1e42c16526e17…

MALICIOUS

PDF

82.0 KB Created: 2021-02-17 19:05:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: e149ac88516f091fc614072776a745b0 SHA-1: 53ed09021accac52e8982f1add1ee2fe3008bff8 SHA-256: d0c1e42c16526e17605a45a4ac4dba9e279ba02350a443820646b05ba44324ff
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with a primary suspicious URL pointing to 'maypoin.ru'. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF is designed as a link farm on disposable hosting, further supporting a malicious intent to redirect users. No scripts were extracted, but the presence of multiple external URIs suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://maypoin.ru/wix?keyword=a+love+to+last+may+29th PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4499935/normal_600d615b1c474.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486565/normal_5fe8fd1c1a3b6.pdfIn PDF document text
    • http://safilow.iblogger.org/wiratapubexasaxenisava.pdfIn PDF document text
    • http://salea.site/afk_arena_promo_codes_september927df.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378167/normal_5fd84f2f736a6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476148/normal_5ffc138db664f.pdfIn PDF document text
    • http://getyourcredit.info/how_to_repair_panasonic_microwave_inverterq6btt.pdfIn PDF document text
    • http://maddot.space/98327982405me0li.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404308/normal_6026642bc7bcb.pdfIn PDF document text
    • http://snegny.com/22091058174261dj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486997/normal_6027846408eb3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471948/normal_601bca7264ec2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404313/normal_5fceb2578b89e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477409/normal_600fe56d690f5.pdfIn PDF document text
    • http://skywonder.space/icao_annex_18_downloadnfegs.pdfIn PDF document text
    • http://pusosokus.iblogger.org/86505921786.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454419/normal_5fcc6e86db8fb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bijiwamosijiw.epizy.com/56849054076.pdfIn PDF document text
    • http://gasukexopesifu.epizy.com/10084492819.pdfIn PDF document text
    • http://vilusosexar.epizy.com/compare_numbers_worksheet_grade_3.pdfIn PDF document text
    • http://ribaxekag.epizy.com/62233200661.pdfIn PDF document text
    • http://zaxiwuxenur.rf.gd/lapopedimapexedozivo.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_off0000f952.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF952 5268 bytes
SHA-256: c975c734a5ec063b68f946e71567dbb680b6512ca50d080bb81ad0b51f92aef6
font_01_sfnt_off00010b24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B24 15416 bytes
SHA-256: e2d2d4420d13509305158fc83e8deedc14c023d0749c601f5f16634486de6149

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