Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab475855d44e759b…

MALICIOUS

PDF

90.6 KB Created: 2021-09-13 03:36:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: cb22faf08b8ef4f568f4a3a4973f1a72 SHA-1: 71ab2bb826cac9865131364779a819519f343407 SHA-256: ab475855d44e759bf97fa69c337c157220251d1ed2e3a4a753543107bc0742bf
182 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and numerous links to external URLs, many of which point to PDF files hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users into downloading and executing a secondary payload. The presence of embedded JavaScript (T1059.007) suggests it's used to facilitate the download and execution of further malicious content, aligning with exploitation for client execution (T1203). The overall behavior is consistent with a spearphishing attachment (T1566.001) used for malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=telugu+movies+online+websites PDF link annotation
    • http://smart-ventures.ch/upload/Editor_Images/files/xezezi.pdfIn PDF document text
    • http://havefuntogether.com/image/upload/File/xuxodepufazodizotozulo.pdfIn PDF document text
    • http://eaupureinternational.com/userfiles/file/xujajugavamejemizulimur.pdfIn PDF document text
    • https://www.assofmt.org/ckfinder/userfiles/files/zajijulegojudukuma.pdfIn PDF document text
    • http://geometrabottero.it/userfiles/files/tikowulalewawibeliz.pdfIn PDF document text
    • http://quaisetoiles.fr/img_pages/file/17693510448.pdfIn PDF document text
    • https://calson.garment-pro.com/ckfinder/userfiles/files/62263498780.pdfIn PDF document text
    • https://unitytradecapital.com/ckfinder/userfiles/files/62506990200.pdfIn PDF document text
    • https://aspit.ro/imagini_ws/vizisuwew.pdfIn PDF document text
    • http://ambulatorioveterinarioscapindandrea.it/userfiles/files/nefagumefexom.pdfIn PDF document text
    • http://bannermaul.com/userData/board/file/30871924993.pdfIn PDF document text
    • http://bishnutoursandtravels.in/userfiles/file/koraguwarufotamo.pdfIn PDF document text
    • http://lezeckastenakosice.sk/upload/files/kikerewowukoperuludu.pdfIn PDF document text
    • http://krishikhabar.net/assets/ckfinder/core/connector/php/uploads/files/fexekawemasuziwe.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/2351f21e8b66806d1bc864ea0c3facda/nivaserezezinikulak.pdfIn PDF document text
    • https://xn--bankkrtya-41a.hu/js/ckfinder/userfiles/files/bimekeburigukowugop.pdfIn PDF document text
    • http://montesantangelo.it/files/files/6187003852.pdfIn PDF document text
    • http://brilliantsolarpaneling.com/userfiles/file/kufirakurolulubosadu.pdfIn PDF document text
    • http://damutech.kz/upload/2021/09files/210913051738091720mle9g.pdfIn PDF document text
    • http://abcgsgeds.friendship-match.com/upload/files/pojemusuvekabalorida.pdfIn PDF document text
    • http://td-mg.ru/uploads/files/2342640614.pdfIn PDF document text
    • http://jingmingtai.com/filespath/files/20210903110055.pdfIn PDF document text
    • http://usateatop.com/_upload/files/wopopoborizumagopef.pdfIn PDF document text
    • http://tizianaiberti.it/userfiles/files/5001419808.pdfIn PDF document text
    • http://sooam.com/files/fckeditor/file/1838933748613e6eef7047c.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/e942fd027f7002f36cc3e7f21155eab1/jagix.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_off0000fc87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC87 18552 bytes
SHA-256: 7f365732798e968a252d9073292d4a6eb729ac41ce1373a6068b783f01c84eba
font_01_sfnt_off00012c6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C6D 10544 bytes
SHA-256: deebf4b3922eae7efe17bafcd6a6b1d8f17d64b925d4c35014f3332f0753e46a
font_02_sfnt_off0001448a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1448A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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