Malicious PDF — malware analysis report

Static analysis result for SHA-256 90cc90bebef28d5b…

MALICIOUS

PDF

71.7 KB Created: 2021-10-01 00:12:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 3b45ed6dc14d07b7cedd44b0bad9b00a SHA-1: 906d6e44d382d76f11e69462837a1b5534d99fd2 SHA-256: 90cc90bebef28d5b1baf2fe3d66015a7171fe3980bbc8ec7b6c7e576e4169337
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and an ML classifier flagged it with high confidence. The PDF contains numerous external links, many of which point to unknown or potentially malicious domains, suggesting a phishing or credential harvesting attempt. Although no scripts were explicitly extracted, the PDF structure and heuristic firings indicate it's designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://tybistanbul.org/resimler/files/momareruxirutonazomev.pdf In PDF document text
    • https://gkia.org/kingkong/userfiles/files/36019334860.pdfIn PDF document text
    • https://podereilmontaleo.it/writable/public/userfiles/file/jupopewapajudowaxe.pdfIn PDF document text
    • http://poliambulatorioargentina.eu/userfiles/files/78231235531.pdfIn PDF document text
    • http://katachizu.com/img/news/files/zekixinukizasetozofiboba.pdfIn PDF document text
    • http://boxethai38.com/upload/file/69313667902.pdfIn PDF document text
    • http://ingmarcofaedi.com/userfiles/files/sorabubalolefafa.pdfIn PDF document text
    • http://ombs.ru/uploads/files/5413574446.pdfIn PDF document text
    • https://megashina24.ru/files/files/95962230108.pdfIn PDF document text
    • http://union.travel/ckfinder/userfiles/files/nabuxo.pdfIn PDF document text
    • https://raguvosbaldai.manovonia.lt/images/files/1495257634.pdfIn PDF document text
    • http://svx.su/ffile/file/gazovogalelupu.pdfIn PDF document text
    • https://olterus.info/contents/files/zatopa.pdfIn PDF document text
    • https://psfund.org/public/uploads/files/cms_files/61466349749.pdfIn PDF document text
    • http://szjglaw.com/uploadfile/file/2021092319035673499.pdfIn PDF document text
    • http://papienbanana.com/user_file/file/10058735787.pdfIn PDF document text
    • http://azizavacanze.com/userfiles/files/77012624053.pdfIn PDF document text
    • https://hv2barrier.com/application/third_party/ckfinder/userfiles/files/fuwufepoxeten.pdfIn PDF document text
    • http://drivingtesttips.ie/fckeditor/userfiles/file/mixopovabuvu.pdfIn PDF document text
    • https://faktxeber.ru/resimler/files/veniwawuxoxagujuj.pdfIn PDF document text
    • http://metamorfozyayincilik.com/userfiles/file/18473081999.pdfIn PDF document text
    • http://savaksangida.com/resimler/files/71189460068.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=the+battle+of+the+labyrinth+pdfPDF link annotation
    • 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b330.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB330 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cb47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB47 10644 bytes
SHA-256: 05440036045bd6e5553bb92c33460586bec05dbd691565811664273ff3ec5667
font_02_sfnt_off0000e356.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE356 18236 bytes
SHA-256: d95f9cfd0bdd88d4cb4d2f3c32e3faf0e8a070dd45f6fde9912008f266763846

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