Malicious PDF — malware analysis report

Static analysis result for SHA-256 387802dd3fa4b921…

MALICIOUS

PDF

74.7 KB Created: 2021-09-14 02:00:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1782d6a82a3b47c2da4b0c869a45573e SHA-1: 7623e2c4ff526c67a2f08f9509e2c557003fa95f SHA-256: 387802dd3fa4b9215197263e272573d4736b0058d4f85de41a27c06186237049
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by an ML classifier as malicious. It contains numerous embedded URLs, many of which point to disposable domains and are structured as a link farm, a common tactic for distributing malicious content or conducting phishing. The presence of external URIs and the link farm heuristic strongly suggest an attempt to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 4

  • 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 https://www.cascatai.com.br/ckfinder/userfiles/files/1831477926.pdf In PDF document text
    • http://bandbaajabarat.com/ci/userfiles/files/kenutipezasukol.pdfIn PDF document text
    • http://gzperson.com/uploadfile/files/86883614385.pdfIn PDF document text
    • https://emtracing.net/userfiles/file/webifasex.pdfIn PDF document text
    • https://mallarpurnaisuva.org/go/file/50849474424.pdfIn PDF document text
    • https://rwd1.thadv.com/upload/files/68241476827.pdfIn PDF document text
    • https://servingltda.com/userfiles/file/68966280103.pdfIn PDF document text
    • https://satnamunicipalcorporation.com/admin/ckfinder/userfiles/files/81500370099.pdfIn PDF document text
    • http://gelateriacool.it/userfiles/files/nikuzijarirop.pdfIn PDF document text
    • http://showdoimovel.com/files/files/vosaxuvazupuxigemenod.pdfIn PDF document text
    • https://marwaservicecenter.com/nbloom/fckuploads/file/bibitukexusolevopur.pdfIn PDF document text
    • http://domario.ru/userfiles/file/71416810400.pdfIn PDF document text
    • http://china-baby-clothes.com/d/files/detodotuzevipasomu.pdfIn PDF document text
    • http://ganteltechnology.com/system/userfiles/file/xozowagepuw.pdfIn PDF document text
    • http://oshcongregation.com/userfiles/file/1180859527.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613bc5f938edc---91391517595.pdfIn PDF document text
    • https://medpressa.ru/files/file/62409850188.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613a08fa5ecfb---tewetoniwababa.pdfIn PDF document text
    • http://usmleworkout.com/files/file/97399557526.pdfIn PDF document text
    • http://ysmenmidwestindia.org/uploads/userfiles/file/file/85916844647.pdfIn PDF document text
    • https://samirkumarpaul.com/ckfinder/userfiles/files/bapajapekunaler.pdfIn PDF document text
    • http://recviem.ru/img/upload/34426744865.pdfIn PDF document text
    • https://greenbins.ca/ckfinder/userfiles/files/famusonifelag.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=unfortunately+pi+has+stoppedPDF 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_off0000c066.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC066 16848 bytes
SHA-256: 060c7b45102eeea6b5d5c4cc00a2f358b1a85e50bdaff9591ad77c018b7388f6
font_01_sfnt_off0000ec9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC9C 10816 bytes
SHA-256: e5a154b9b284a862623724b585fa07c25fae93e6eaa9107efd3da3df2043b89f
font_02_sfnt_off00010583.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10583 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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