Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e19604c7b258429…

MALICIOUS

PDF

70.4 KB Created: 2021-10-04 09:18:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: bd6d901272b915924569fee34bc0e052 SHA-1: 942c66c7285491b07f22886f1a9eb74b9b93fb87 SHA-256: 9e19604c7b258429e36e1286e6579f05fae65791b0715a0c1ea6cf021951f36f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to potentially malicious domains, and one heuristic identified it as a link farm on disposable hosting. While no scripts were explicitly extracted, the nature of the embedded URLs and the detection suggests an attempt to redirect users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://4grd.com/cmsimages/file/vonolilawavex.pdf In PDF document text
    • https://officialbacknumber.org/editor_up/vezivebenis.pdfIn PDF document text
    • https://infotechsystemsonline.com/ital/www/img/file/739838897.pdfIn PDF document text
    • https://ceccarbotosani.ro/userfiles/file/22588787752.pdfIn PDF document text
    • https://hohsingfiber.com/ufiles/files/38540911453.pdfIn PDF document text
    • https://martensmgt.com/business_school/uploads/file/judipeju.pdfIn PDF document text
    • http://cobansut.com/userfiles/file/43218962016.pdfIn PDF document text
    • https://istanajp.com/contents/files/nulodidajaxapebi.pdfIn PDF document text
    • http://bienchidan.org/uploads/files/45660712935.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1613d134db9f79---vulapefurud.pdfIn PDF document text
    • https://condominiovillage.com/userfiles/file/topajejipuperonak.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/16142940d2b4c4---42130473106.pdfIn PDF document text
    • http://sanyosushiglendora.com/uploads/files/16416689930.pdfIn PDF document text
    • http://em-mould.com/ckfinder/userfiles/files/21128798720.pdfIn PDF document text
    • https://xenang-mitsubishi.com/fckupload/file/18190436538.pdfIn PDF document text
    • http://maimungkorn.com/UserFiles/file/vivetifonapekujunasak.pdfIn PDF document text
    • http://harryreichert.de/uploaded_pics/News/file/gidufiwilumifujatafabofa.pdfIn PDF document text
    • http://www.itidharamshala.in/images/uploads/files/72258498435.pdfIn PDF document text
    • http://etenindex.nl/images/uploads/82806452616.pdfIn PDF document text
    • http://biosystech.com/pdsFck/file/27636073710.pdfIn PDF document text
    • http://stimatacasa.eu/userfiles/files/74281097452.pdfIn PDF document text
    • http://jjc-dev.com/userfiles/file/58760820946.pdfIn PDF document text
    • http://technocom.pl/editor/file/15860130496.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=7th+class+social+science+textbookPDF 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_off0000b29d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB29D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000caaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAAF 16464 bytes
SHA-256: d0fe89e6be3b1fea0f3ccdf19191a383c1358eeae757b2fab9f60efd732999d7
font_02_sfnt_off0000f415.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF415 10516 bytes
SHA-256: 768b4b20fc405f07a74e7cd6a866a4271d4359722605acb22d70101c4b2dfd89

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