Malicious PDF — malware analysis report

Static analysis result for SHA-256 b63b932d18487530…

MALICIOUS

PDF

72.7 KB Created: 2021-03-01 13:49:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-13
MD5: 5ce35ed633acad250a729c079bd8c8c5 SHA-1: 37fecb5e5022c133ea7448ca9d68331e8da6caf3 SHA-256: b63b932d18487530cae099b32b73a19982771d1b71fc6772cb67dc1ed5e2508d
126 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many pointing to disposable domains and acting as a link farm, a common tactic for phishing or distributing further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically highlights this behavior, suggesting the document's primary purpose is to redirect users to potentially harmful 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://resalured.ru/wix?keyword=dutch+colonial+house PDF link annotation
    • http://faceskinagainbeauty.xyz/bilinear_transformation_solved_examples9tl7q.pdfIn PDF document text
    • https://cdn.sqhk.co/rufebumu/ghNmicT/34294558350.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420237/normal_5fdca3d12f988.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366015/normal_5fdbe73456e40.pdfIn PDF document text
    • https://cdn.sqhk.co/vuvupewog/QjdQdCU/tunein_free_music_apps.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485704/normal_60346c044d387.pdfIn PDF document text
    • http://netewe5.xyz/gexodazemupaw6ywke.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406775/normal_60251fce977e3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456122/normal_6013c3754cc52.pdfIn PDF document text
    • https://cdn.sqhk.co/tebefaravuz/6vwibgh/54038543255.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/kubedukowug/alchemy_training_guide_skyrim.pdfIn PDF document text
    • http://magapupegijovot.epizy.com/beardstown_ladies_common-_sense_investment_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/wapabefizosumi/tugujabogokajuwalare.pdfIn PDF document text
    • https://s3.amazonaws.com/rexogeguxosix/palelenizidupezor.pdfIn PDF document text
    • https://s3.amazonaws.com/sonutopexaramuf/bed_sheets_for_sale_in_durban.pdfIn PDF document text
    • http://dodigemadepa.epizy.com/bufejemukubobuzobamabubeb.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_off0000e1d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1D1 4788 bytes
SHA-256: 2430b00f0d78ea31968340ed1fe848682423747ce9ea979672632a257a8b3a42
font_01_sfnt_off0000f21b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF21B 10396 bytes
SHA-256: b9d4a524f13dcb72f40ef3f2ae6fb46ff54e1eff3e0b567164df671dc47b2f15

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