Malicious PDF — malware analysis report

Static analysis result for SHA-256 158f107ec22eabc8…

MALICIOUS

PDF

96.5 KB Created: 2021-09-18 20:27:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b636a8924fde619077e313e556c20b23 SHA-1: e2f49812f14e0f98c8bd28ff1269f2613c7815b9 SHA-256: 158f107ec22eabc84b7a6e3792ba801a7f09ebefa17bb220ff176d65c0fadd74
74 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many hosted on disposable domains, indicating a malicious intent to redirect users. The ML classifier strongly flagged this PDF as malicious, and the presence of embedded JavaScript suggests it is used to facilitate the redirection or potentially download further payloads. The document's structure and numerous links point towards a link farm or phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 5

  • 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://smidgel.ru/uplcv?utm_term=how+to+transfer+data+from+old+sd+card+to+new+sd+card+android PDF link annotation
    • http://quimis.org/js/ckfinder/userfiles/files/46249553080.pdfIn PDF document text
    • http://czyxchem.com/upload/files/lajofakumutifo.pdfIn PDF document text
    • http://rund.cz/UserFiles/File/xufasibodinopipelanuximi.pdfIn PDF document text
    • http://kenshopvn.com/uploads/files/sadokitutafe.pdfIn PDF document text
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/97151192956.pdfIn PDF document text
    • https://tndvn.com/js/ckfinder/userfiles/files/tonaluvikan.pdfIn PDF document text
    • http://www.veslovani-vsb.cz/soubory/file/86024032492.pdfIn PDF document text
    • https://beldapromosyon.com/calisma2/files/uploads/31057622759.pdfIn PDF document text
    • http://www.boldino-hotel.com/ckfinder/userfiles/files/98663430139.pdfIn PDF document text
    • https://laflammerouge.ch/userfiles/files/duvibifi.pdfIn PDF document text
    • http://ahnil.com/userData/board/file/ranad.pdfIn PDF document text
    • http://rqconsultores.com/userfiles/file/71500075586.pdfIn PDF document text
    • https://dotcomtravelegypt.com/userfiles/files/sefazanasufonuliwi.pdfIn PDF document text
    • http://gk-eventus.ru/admin/ckfinder/userfiles/files/62711097296.pdfIn PDF document text
    • http://cheliabinsk.realxenon.ru/uploads/files/vanugodasinofab.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/6fffe069064ced7f90c9c0e890728fe0/resobuw.pdfIn PDF document text
    • http://gr-chem.com/upload/files/31793377801.pdfIn PDF document text
    • https://felicityokolo.com/file/lusopunixitugax.pdfIn PDF document text
    • https://sjamsul-hidajat.id/ck_uploads/uploads/files/rinomepefukeruloxiniweni.pdfIn PDF document text
    • http://phelieuviethung.vn/upload/files/43082928321.pdfIn PDF document text
    • https://afra24.com/basefile/afra24/files/demupepigogavagexufexero.pdfIn PDF document text
    • http://gld-lining.com/user_img/files/bigajekunedowudegurisog.pdfIn PDF document text
    • https://wfbulgaria.com/uploads/wysiwyg/files/6764528682.pdfIn PDF document text
    • http://kppzp.pl/userfiles/file/butavokarofikiz.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_off000112ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112AD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012ac4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AC4 10712 bytes
SHA-256: 7a31ae64f6dce6f145c9d140acdd1ad041172e2f47f459bc19d35c41a6efa332
font_02_sfnt_off0001435b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1435B 18632 bytes
SHA-256: 395a17f4e575eae87a3150e6954071fa99980cf2df7fa8ae1218ac2e71169663

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