Malicious PDF — malware analysis report

Static analysis result for SHA-256 13804ed311e7e295…

MALICIOUS

PDF

83.5 KB Created: 2021-09-19 02:31:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 63cda785874edf8afca5a7cb0d874f63 SHA-1: 0d0e939d9b7141328624b6229eeec3b12241b893 SHA-256: 13804ed311e7e2953eabc7bc5f5c190b7eff4fd949a98002e325ac783c306986
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs, including one pointing to a raw IP address, suggesting it is designed to redirect users to potentially harmful websites. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a link farm on disposable hosting, a common tactic for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://wastran.ru/uplcv?utm_term=android+7+dark+mode PDF link annotation
    • http://www.peritaonline.es/ckfinder/userfiles/files/72024977868.pdfIn PDF document text
    • http://185.33.116.142/~bbyacht01/upload/files/74562301949.pdfPDF link annotation
    • https://gdaniec.com/upload/files/78293294143.pdfIn PDF document text
    • https://tese.in/ckfinder/userfiles/files/nosalotejo.pdfIn PDF document text
    • http://terwaarde.be/ckfinder/userfiles/files/25673215084.pdfIn PDF document text
    • http://cathugo-catamarans.de/res/wysiwyg/file/vudenadelomujupedevoraxix.pdfIn PDF document text
    • http://gazomotor.com/allinone/file/8053958843.pdfIn PDF document text
    • http://upasamed.org/Content/uploads/files/67377458238.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/b5u97alfgv2668fk4n6ra5i8gj/98092327898.pdfIn PDF document text
    • https://bonaparte.cappencms.com/templates/files/14447442930.pdfIn PDF document text
    • http://abwmercury.com/uploads/files/xifegepodavigevujawavufon.pdfIn PDF document text
    • https://open-call.fr/uploaded/files/96238028292.pdfIn PDF document text
    • http://kartinatv.org/uploads/files/gekigo.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613c42141b216---12069478279.pdfIn PDF document text
    • http://www.vinoplaza.nl/img/upload/files/febevet.pdfIn PDF document text
    • https://laurallo.com/ckfinder/userfiles/files/rixivujodu.pdfIn PDF document text
    • http://samtle.net/ckupload/files/zotisidorawirigi.pdfIn PDF document text
    • http://inimtrento.it/userfiles/files/39019075066.pdfIn PDF document text
    • http://tiszaladany.hu/upload/file/20863890635.pdfIn PDF document text
    • https://magerp.org/upload/files/gafisixeranupoxor.pdfIn PDF document text
    • http://bouwbedrijfansing.nl/userfiles/file/nelonunumiviv.pdfIn PDF document text
    • https://landtop.com/filespath/files/20210909165427.pdfIn PDF document text
    • http://seattlebestteriyaki.com/uploads/files/47383009268.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_off0000e563.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE563 10220 bytes
SHA-256: b2a3d09b80f3932020a4dd611b7914dca0ac117ebf3e6d38829b27977cc7bc84
font_01_sfnt_off0000fc4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC4E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011460.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11460 17056 bytes
SHA-256: 52a98cacbdb80420afbd3014096db891eaadce499d58a7c8ecf70c0d52f1d5e2