Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2d8e5165db53db3…

MALICIOUS

PDF

75.0 KB Created: 2021-09-25 01:18:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 45a115ff58ec87d14303e724a907b68a SHA-1: 20707ec4d98a7f2c4a418c27ccf837e251601783 SHA-256: b2d8e5165db53db3b29f1cbe93923714e0873c92919d320c5bc9d1876eed0138
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs and is flagged as a link farm on disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious document, likely intended to lead the user to a malicious site or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://bresky.cz/res/file/30227070001.pdf In PDF document text
    • https://vadihosting.com/calisma2/files/uploads/zafurafebirobitaso.pdfIn PDF document text
    • http://ahzycw.com/upload_fck/file/2021-9-7/20210907185648425820.pdfIn PDF document text
    • http://pro-group.ru/userfiles/files/69583889074.pdfIn PDF document text
    • https://marjoyunlar.com/calisma2/files/uploads/8450300277.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16137484b660cc---82185885301.pdfIn PDF document text
    • https://zdravka.hlpr.hr/userfiles/file/pumalunidoripusanoxadabix.pdfIn PDF document text
    • http://lafenicealcamo.it/userfiles/files/15398877507.pdfIn PDF document text
    • http://datavincity.com/uploads/ckfinder/files/zejadamijoda.pdfIn PDF document text
    • http://tafgambiatours.com/userfiles/file/nodugiwusetezan.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/1612f781c2381c---97585209014.pdfIn PDF document text
    • http://marienoellebermond.com/img/uploaded/file/35264313564.pdfIn PDF document text
    • https://groupunsur2.com/contents/files/pewarefakasepemajuvu.pdfIn PDF document text
    • http://gabinetpro.gabinetpro.pl/kosmetyczka/krakow/files/92446055326.pdfIn PDF document text
    • https://sabresources.com/FCKuploads/file/regerakokogebe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=shadow+fight+2+mod+unlimited+money+and+gemsPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0000e7b7.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xE7B7 18316 bytes
SHA-256: 7f680a8582105bca37a97e0e3fcb5b6a15153606a87451444f7aee3a0e59da7a
font_00_sfnt_off0000a706.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA706 15920 bytes
SHA-256: e6f6ccec098928cc44cac5abe5421dfc7eeb4ba4845aafd43ad6c40158c50d1e
font_01_sfnt_off0000cfa6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFA6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00010485.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10485 11196 bytes
SHA-256: 9f6f8226ad142d62294cc6b6b07f4a9d2a1753c065d996d66fafff75cf1fc826

Open this report in the interactive analyzer, or submit your own file for analysis.