Malicious PDF — malware analysis report

Static analysis result for SHA-256 29b9a1032101f145…

MALICIOUS

PDF

84.7 KB Created: 2021-09-17 15:46:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f4efdc671812608e3bf779c3879a9928 SHA-1: 484f6ee08df7a13ac00938fde68e598b15c372df SHA-256: 29b9a1032101f1458c5ad685836b7b22e0a385d58601c84e677560014be0ea3f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV, indicating malicious intent. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests the document is designed as a link farm, pointing to numerous distinct domains, likely to obscure malicious activity or distribute phishing lures. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the link farm heuristic suggest potential for JavaScript execution or redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 http://hotelgiottotorino.com/userfiles/files/86515540656.pdf In PDF document text
    • http://hsi-international.com/ckfinder/userfiles/files/watuzijewerowe.pdfIn PDF document text
    • http://myphamasia.net/upload/files/27275765975.pdfIn PDF document text
    • https://cnc-ar.ro/files/file/24686927548.pdfIn PDF document text
    • http://taiwan-casters.com/userfiles/file/biname.pdfIn PDF document text
    • http://zgkimsteszew.pl/img/upload/files/52702336740.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/161331126582f9---78191274819.pdfIn PDF document text
    • http://gtshotel.it/images/file/78160096296.pdfIn PDF document text
    • http://kondicionery-ivanteevka.ru/upload_picture/file/78052027511.pdfIn PDF document text
    • http://luberoff.com/userfiles/file/revujuwupufetazavujadew.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/161422d21140d7---17083904090.pdfIn PDF document text
    • http://gzmzwl.com/Uploadfiles/files/vunutekekevape.pdfIn PDF document text
    • http://baracenter.be/userfiles/file/3998998076.pdfIn PDF document text
    • http://xn--80aaa1acmiejxr6d7fg.xn--p1ai/data/files/50868367909.pdfIn PDF document text
    • https://weilaimachinery.com/userfiles/files/96448720717.pdfIn PDF document text
    • http://nyitotthaz.hu/userfiles/files/69362982945.pdfIn PDF document text
    • http://fujieshubao.com/zk/UploadFile/file/2021091711002873499.pdfIn PDF document text
    • http://ff-engineering.com/userfiles/files/jelasowefomutitab.pdfIn PDF document text
    • http://letdentalab.com/img/files/rekijurixasemufevi.pdfIn PDF document text
    • https://genia-groupe.fr/images/files/wozaridevumejibiminudoda.pdfIn PDF document text
    • http://swhos.com/upload/files/sufazuge.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=upload+photos+from+android+phone+to+computerPDF 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_off0000e418.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE418 18500 bytes
SHA-256: 05be192e9875f3a0e6379901c4b620fc2919e487eaa346b9831cec67eb677205
font_01_sfnt_off000113a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113A2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012bb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BB9 10992 bytes
SHA-256: 02a364ce5e24ecc58bd1331f475a182ff542b837e9cf486353119f94430aae15

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