Malicious PDF — malware analysis report

Static analysis result for SHA-256 d019179857615a16…

MALICIOUS

PDF

90.5 KB Created: 2021-09-20 07:02:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 753cdaf1349fc92afa0ca1a205bceee6 SHA-1: 50c93adef60262f6e6b09eda826accb643d16a89 SHA-256: d019179857615a169232f1d05ad45ebe6b86f7024ac9df42f682f45aeffdc7d4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs pointing to various domains, suggesting it functions as a link farm or phishing lure. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a strategy of using disposable hosting for redirection. No scripts were extracted, but the overall structure and URL distribution point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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 https://infrive.ru/uplcv?utm_term=50+shades+darker+soap2day PDF link annotation
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/3qoc4463l3603av076aosqrlpr/rogiliwiwuduvopekifotawo.pdfIn PDF document text
    • http://esistore.com/userfiles/file/27884615897.pdfIn PDF document text
    • https://markapin.com/calisma2/files/uploads/sofilosisefufodidaxe.pdfIn PDF document text
    • https://procogs.com/FCKeditor/file/65565242280.pdfIn PDF document text
    • http://personal.sut.ac.th/chantira/port/ckfinder/userfiles/files/23194007445.pdfIn PDF document text
    • http://kutyasturak.hu/images/files/tigesuxowiropedux.pdfIn PDF document text
    • http://arisutour.com/ckupload/files/pizixagunovepa.pdfIn PDF document text
    • http://singer-island-condos.com/userfiles/files/29583293773.pdfIn PDF document text
    • http://dachastyle.com/userfiles/file/zugaj.pdfIn PDF document text
    • http://krakowska98.com/zdjecia/fck/file/98531897270.pdfIn PDF document text
    • https://giorgiosantinelli.it/file/ruxiwataxawim.pdfIn PDF document text
    • https://journalofcritique.com/ckdosyalari/upload/files/vebifapovilinesagesuba.pdfIn PDF document text
    • http://templeton.sk/userfiles/file/zufuwikabugekugov.pdfIn PDF document text
    • http://studionegrelli.it/userfiles/files/moveravekixowawimamasapu.pdfIn PDF document text
    • https://readandenjoy.ae/userfiles/files/pejupotakipawerupaduse.pdfIn PDF document text
    • http://studioguidobarbieri.it/userfiles/files/79962343590.pdfIn PDF document text
    • https://letstravelforacause.com/miet/assets/files/xuzitisegodegiwog.pdfIn PDF document text
    • http://showdoimovel.com/files/files/29365402607.pdfIn PDF document text
    • http://wxdyzs.com/userfiles/files/52408945852.pdfIn PDF document text
    • http://dc-42351dc5a6b3.prshots.es/uploads/userfiles/1631024993/files/gofuwebesejuveri.pdfIn PDF document text
    • http://denkobarbell.com/_upload/files/jererodupakakotazufu.pdfIn PDF document text
    • http://hennel.hu/sources/elemek/file/58912646248.pdfIn PDF document text
    • https://eastmangroupllc.net/ckfinder/userfiles/files/44840479077.pdfIn PDF document text
    • http://nieruchomosciklodzko.pl/files/file/pezagobojufa.pdfIn PDF document text
    • 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_off0000f952.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF952 10632 bytes
SHA-256: a6388200599424f7a5cd078b948671796769c00d385a2f3e50e24004f6afce55
font_01_sfnt_off000111dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111DD 19300 bytes
SHA-256: 592d761ef85db44e0c7e4fa55994f24d74cae7989a27916d3a16483cc081e555
font_02_sfnt_off00014480.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14480 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1