Malicious PDF — malware analysis report

Static analysis result for SHA-256 62c3af4b59d88a9e…

MALICIOUS

PDF

95.0 KB Created: 2021-02-13 10:22:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 7f188562c460889ecebfc40cbc91dfb2 SHA-1: b2f95f9f0af8bb47883a984037ba4151262f5b20 SHA-256: 62c3af4b59d88a9e87f134d9a67ffd42c607dbd40c5c9120c1fbd1ae6ae89365
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting, and is flagged by heuristics as a link farm designed for SEO manipulation. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The document body, though heavily obfuscated, contains text related to downloading a PDF, reinforcing the lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://seumenha.ru/wix?keyword=convoluted+universe+book+5+pdf+download+free PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4445733/normal_60240cbf9893f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4428342/normal_600327658fdf5.pdfIn PDF document text
    • http://the-english-temple.com/rageguxuvabapidapaxoded7cfl2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448984/normal_6022e24f3e7b4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452381/normal_5ff7089269e4e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4443326/normal_5fcce7064c313.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420917/normal_5fd66ff2e5d9b.pdfIn PDF document text
    • http://axecheat8.xyz/spyder_xtra_manualyh8ex.pdfIn PDF document text
    • https://cdn.sqhk.co/gukokefa/bfhjMjd/battletech_dragon_ii.pdfIn PDF document text
    • http://govnososal.xyz/abstract_noun_worksheets_for_class_7xxp2l.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487192/normal_60130ebee5815.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367643/normal_5fd1b2a91c68a.pdfIn PDF document text
    • https://cdn.sqhk.co/tekuligote/wvGJhc4/nubimexevupulipijop.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450045/normal_60000596dacac.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367279/normal_601bb2b01e15c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378393/normal_5fd8671c742cb.pdfIn PDF document text
    • http://kartaidatodemeleri.com/bdo_diners_club_rewards_catalogue13sb4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403816/normal_6013924564c26.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/rimepusox/reruwagozarotomu.pdfIn PDF document text
    • https://s3.amazonaws.com/bexolamabad/47455302397.pdfIn PDF document text
    • https://s3.amazonaws.com/xutomoxu/vidmate_install_apk_uptodown.pdfIn PDF document text
    • https://s3.amazonaws.com/sinadi/ronufuxemiwu.pdfIn PDF document text
    • https://s3.amazonaws.com/sedimeraxufi/nidizovuwixo.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_off0001368f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1368F 5420 bytes
SHA-256: da5fe61ec45e1f0a6ea7ed424dbd2f32f92df28ec76172b22cc64ac8bdac4be8
font_01_sfnt_off0001491d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1491D 10824 bytes
SHA-256: 2659be5a545894678016115a6c7c51878b798866a152c3238114fda12fd56dba

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