Malicious PDF — malware analysis report

Static analysis result for SHA-256 9993b53ec2f0433f…

MALICIOUS

PDF

71.0 KB Created: 2021-10-02 11:02:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 19f52304179b26d8228ff6cc367f5df4 SHA-1: d84e84a777b3684aa249992dbb0e59c834cf2e83 SHA-256: 9993b53ec2f0433f905fa69fe4502187015dc474a764424374d2730004cc3a17
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many pointing to potentially disposable domains, suggesting a link farm designed to redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags this behavior, indicating a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://abwfinlay.com/uploads/files/12235668449.pdf In PDF document text
    • http://yuanjen.com/ckfinder/userfiles/files/rufolumureniwefidoga.pdfIn PDF document text
    • http://www.umadai.com/ckfinder/userfiles/files/lagaroxemeruvemewupevepav.pdfIn PDF document text
    • http://fuguchair.com/upfolder/e/files/20211001222628.pdfIn PDF document text
    • https://saintarseny.ca/sites/saintarseny.ca/files/file/tofega.pdfIn PDF document text
    • https://kamarkosong.com/contents/files/pukol.pdfIn PDF document text
    • http://namhungholdings.com/uploads/ckfinder/files/87516212987.pdfIn PDF document text
    • https://geniodelweb.com/file/mesani.pdfIn PDF document text
    • http://dakdekkersindex.nl/images/uploads/nomesifevilonojusemonatuk.pdfIn PDF document text
    • https://kalyna.ua/sites/default/files/userfiles/file/81877933787.pdfIn PDF document text
    • http://ciarajewellery.com/editor_upload/file/nowom.pdfIn PDF document text
    • http://pinturasoltra.com/images/slider/files/sopirifakevaziwodit.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/40d258ee54f2a0a7cf10a78a68df4bbf/lufikaponapesebigimizen.pdfIn PDF document text
    • http://alrabbancapital.com/file/files/65534215243.pdfIn PDF document text
    • https://bitree.com/ckfinder/userfiles/files/zowenoboraduvumuzujukemiw.pdfIn PDF document text
    • https://shidoremicrosys.com/media/deninusukiwiforuxipajuze.pdfIn PDF document text
    • https://volandovia.it/public/fileeditor/file/17420913164.pdfIn PDF document text
    • https://gotoko.com/cmsv2/upload/files/63313398898.pdfIn PDF document text
    • http://uro-medical.pl/zdjecia/fotki/file/ladutopododitamov.pdfIn PDF document text
    • http://bafiti.com/sklep/userfiles/file/mazor.pdfIn PDF document text
    • http://2016.letnifestiwal.pl/ckfinder/userfiles/files/12447918400.pdfIn PDF document text
    • http://elitakhealing.com/ckfinder/userfiles/files/jisirakiwonifefewi.pdfIn PDF document text
    • http://narnivet.com/userfiles/files/99270592782.pdfIn PDF document text
    • http://burelomdo.com/ckfinder/userfiles/files/70913585664.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=stress+induced+mutagenesisPDF 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_off0000b384.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB384 10720 bytes
SHA-256: 4b8bb77cd3c4652b49c6042917249be5bbc7ab8cfd211d814deceae16c247e7b
font_01_sfnt_off0000cbdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBDD 16520 bytes
SHA-256: 3b0939a27b0edc0af5631a5624c8ff8b0fd6cdbefbf8fafd168cc4fb6d3b5845
font_02_sfnt_off0000f666.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF666 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1