Malicious PDF — malware analysis report

Static analysis result for SHA-256 e196bb723abdc97e…

MALICIOUS

PDF

87.3 KB Created: 2021-06-10 02:07:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 10b05a267a5771cb17a982f288fb4a0e SHA-1: aa62c8bfa0c86d44e070d4608d37a542249e8096 SHA-256: e196bb723abdc97ef366603bcee7a74269de125a537c8ff214283ebb012b144a
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were directly extracted, the PDF structure and embedded URLs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://kuzutuzo.ru/123?utm_term=dell+inspiron+15+5000+spec+sheet PDF link annotation
    • https://nusuvonofa.weebly.com/uploads/1/3/1/8/131872273/zositu-vabejar.pdfIn PDF document text
    • https://xowesujitevenas.weebly.com/uploads/1/3/5/3/135321640/48b3ed.pdfIn PDF document text
    • https://buserakufazuwus.weebly.com/uploads/1/3/4/0/134097478/ratizurov.pdfIn PDF document text
    • https://winulovovitazu.weebly.com/uploads/1/3/0/7/130740324/6701815.pdfIn PDF document text
    • https://jotelozaji.weebly.com/uploads/1/3/4/4/134484012/kezepomarugojidir.pdfIn PDF document text
    • https://pupuwovojetisig.weebly.com/uploads/1/3/1/4/131438468/5055687.pdfIn PDF document text
    • https://xovaxavirot.weebly.com/uploads/1/3/4/8/134853903/10763c0.pdfIn PDF document text
    • https://wajefoxefibivi.weebly.com/uploads/1/3/2/8/132814680/xebug_votut.pdfIn PDF document text
    • https://medefidonirefej.weebly.com/uploads/1/3/5/3/135324812/4760776.pdfIn PDF document text
    • https://subifegeriw.weebly.com/uploads/1/3/5/3/135348524/a4ec802a2.pdfIn PDF document text
    • https://mabaxezo.weebly.com/uploads/1/3/4/7/134766945/totukixoru_dimewen_jubosakipuzurer.pdfIn PDF document text
    • https://kevonixoxudunu.weebly.com/uploads/1/3/0/7/130775897/4271383.pdfIn PDF document text
    • https://kazirevuteguzug.weebly.com/uploads/1/3/2/6/132681824/kijivajoragalakinivo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/6bd60073-20fc-490a-899e-ee24a3dbc8d9/nifunege.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/66fb4041-65ba-4056-86f1-ab125c711ed5/cuando_la_luna_tiene_un_circulo_alrededor.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1bf4c73e-d17c-4d4d-b2c4-3b43b40a7d13/19958394496.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/53596cac-c16f-41d5-94cc-1137a0962a9c/fast_metabolism_diet_snacks_phase_1.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b192d79c-997e-4e46-ac27-a293e0190ed0/81591615984.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b09d037d-90ab-4b6d-b350-343cfeed7b25/60799624989.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d944b760-93e1-412a-96dc-27bc83e1e722/cours_gestionnaire_de_paie_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bf6be5f9-5d88-4cf2-ba10-163b05ba2209/what_is_the_colour_of_chlorine_solution.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b7b64cc3-7d5c-4d01-93dc-025257e58916/36069532718.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f230.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF230 4916 bytes
SHA-256: 8312ad99866198edfb4847b8f1fd1f7d1999d60cb6c5644df98a526fdc67e3bb
font_01_sfnt_off000102e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102E7 12380 bytes
SHA-256: 72943111247a395f51bef543008153e607151e6fd4b1bdd2a8fa12795b81a55f
font_02_sfnt_off00012c10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C10 16204 bytes
SHA-256: 541fa2b6826b0add99b7d5a173ef1e6a5567607b5192f75b810eb17d6a563501
font_03_sfnt_off0001413e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1413E 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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