Malicious PDF — malware analysis report

Static analysis result for SHA-256 d477f28f2c02bde2…

MALICIOUS

PDF

73.8 KB Created: 2021-03-13 21:53:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 5b51e8087df74408caab0dd47ba15462 SHA-1: a25136bf2c821d48a9c8a4e1764e0cb0e0b88740 SHA-256: d477f28f2c02bde28825d99662c780ca4b4b65a83d7f55ffb32183a97d0f8a3d
126 Risk Score

Malware Insights

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

The file is identified as a malicious PDF by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which lead to unknown or potentially malicious domains, suggesting a phishing or link-farming attempt. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further indicates a pattern of using disposable hosting for these links. No scripts were extracted, but the presence of external URIs and the overall structure point towards a phishing lure.

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://xezojetit.ru/wix?keyword=hot+rod+heart+john+fogerty+tab PDF link annotation
    • http://medgaj.com/cuarto_paso_de_aayefmy.pdfIn PDF document text
    • http://magnitoli-2ekran.site/mibukavarlml4.pdfIn PDF document text
    • https://cdn.sqhk.co/sadetujadufi/JJsTMhc/demon_pa2_emulator_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/fedelubu/Nha0LyB/21396164269.pdfIn PDF document text
    • http://zotikarida.medianewsonline.com/v_for_vendetta_removed_from_netflix.pdfIn PDF document text
    • https://cdn.sqhk.co/jegamaxegev/0geGhiu/pitovafewosezizomudujal.pdfIn PDF document text
    • https://cdn.sqhk.co/savunowudob/ijdjeib/best_captions_for_pics_in_urdu.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/levovod/biogeochemical_cycles_in_ecosystem.pdfIn PDF document text
    • https://ff06b2c9-6223-4357-b4d5-1bf3807c749f.filesusr.com/ugd/717131_4b1260b35bd8472c8404ade64dcf9d89.pdf?index=trueIn PDF document text
    • https://6e7ef639-f89a-4701-86f9-710a836f1183.filesusr.com/ugd/12745a_9b04125a7cb74a60b91cbf669e0307a1.pdf?index=trueIn PDF document text
    • http://roveramo.atwebpages.com/84975490183.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3c2b0af0-7d1f-4e9b-ab29-7dfcdcd327b3/what_is_the_goal_of_universal_design_for_learning.pdfIn PDF document text
    • https://8a89c5bc-485b-4808-980c-66c60e8d9908.filesusr.com/ugd/834936_2218ec17d8e04e07820c2a534a17b3e3.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3dfdeecd-a352-4e06-985c-94fad5ffe3c1/31262227001.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e73253af-dad3-4d7a-b680-c8c2a4656141/wozewagewalazug.pdfIn PDF document text
    • https://6f29901e-f5c9-4775-879c-97b2de5c8d5b.filesusr.com/ugd/0bf195_5d2289c8d31c41cb88256ff73673d524.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1c5c47fe-b46f-40ad-86fe-7a334c59fb39/modelo_de_certificado_de_inspeccion_tecnica_vehicular.pdfIn PDF document text
    • https://s3.amazonaws.com/zesixefe/pacific_textiles_holdings_ltd_annual_report.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_off0000e216.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE216 5236 bytes
SHA-256: fb22900167ea7615bf4011f2447bed58dd0014fdf613e481e297f6fc7a3fae48
font_01_sfnt_off0000f3f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3F0 11388 bytes
SHA-256: d310c1610f84316fbcef3e04a4fc2c6a46f50edf719452f7ce3782deace87c05

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