Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a5dce8b99993819…

MALICIOUS

PDF

90.3 KB Created: 2021-09-22 09:47:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 19d2c1ef072afd979c5a164f88c2afd2 SHA-1: f934e89ff15ac4c2a8c19c7fe512861784d8b3df SHA-256: 9a5dce8b999938195d46f553d7e82e8359b0049a10e11b3c2a35a234c81cb9b0
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are linked to disposable hosting and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution through these links. The embedded JavaScript is likely used to facilitate the redirection or obfuscate the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://archism.ru/uplcv?utm_term=dead+ahead+zombie+warfare+hack+ios PDF link annotation
    • http://chongros.com/userData/board/file/luropemujosiraj.pdfIn PDF document text
    • http://rm-centr.ru/uploads/file/48984275658.pdfIn PDF document text
    • https://securitydm.net/slicice/file/93879874017.pdfIn PDF document text
    • http://sushrutproctology.org/ckfinder/userfiles/files/mikegalumixumano.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142ff3d6e8ca---84617506024.pdfIn PDF document text
    • https://flims.atelierleuthold.ch/userfiles/files/toxedo.pdfIn PDF document text
    • https://praktijk-fix.nl/userfiles/image/file/juduliguzavuju.pdfIn PDF document text
    • http://laconchigliacasevacanze.it/userfiles/files/nosafolifasajesedidaxero.pdfIn PDF document text
    • https://soswzgierz.pl/web/uploads/files/11577365187.pdfIn PDF document text
    • http://mispuntossaga.com/campannas/file/41823134798.pdfIn PDF document text
    • http://tandartsindex.nl/images/uploads/15552190081.pdfIn PDF document text
    • https://tannhatviet.vn/upload/files/74490386140.pdfIn PDF document text
    • http://all-vehicle.net/js/upload/files/89181878953.pdfIn PDF document text
    • http://www.enjoyvaltellina.it/admin/ckfinder/userfiles/files/8088408317.pdfIn PDF document text
    • http://sapientgenerator.ru/files/userfiles/files/63140202886.pdfIn PDF document text
    • http://stressmanagement-karriere.de/userfiles/file/bowekizisukitenib.pdfIn PDF document text
    • https://infiniteprospects.com/FCKeditor/file/gomekalile.pdfIn PDF document text
    • https://cytairtool.com/test/userfiles/file/20210903_cadb0.pdfIn PDF document text
    • http://f-kcc.jp/user_data/userfiles/files/vezotiwameki.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://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_off0000f9bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9BC 10872 bytes
SHA-256: 4c1a59346a8b1ada88c97cc16301469ef55b66091181012d5b4b31f4116bc597
font_01_sfnt_off000112e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112E8 18824 bytes
SHA-256: 5efa4b1d69bbe865776ad0d4919b2f1becf387d41cfd014a387bfd540d20375d
font_02_sfnt_off00014458.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14458 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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