Malicious PDF — malware analysis report

Static analysis result for SHA-256 d68a4678948ed557…

MALICIOUS

PDF

70.7 KB Created: 2021-10-02 21:13:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a649f0f9da6aaf8084d4e311cd9674a5 SHA-1: 4dcafd2fcf121c5bc8282577a56a2d16838172fa SHA-256: d68a4678948ed557fb08de689116e67b3efec64204ffdd88b0d62e0d7a4fbc54
146 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs and a clickable URI pointing to an IP address, suggesting it's designed to redirect users to potentially harmful content. The PDF structure also indicates it's a link farm hosted on disposable domains, a common tactic for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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://crewmak.ru/uplcv?utm_term=all+you+can+eat+lobster+buffet+rhode+island PDF link annotation
    • https://www.area-tlc.com/public/ckfinder/userfiles/files/wopidijalaja.pdfIn PDF document text
    • https://dukra.sk/editor_uploads/files/situzipaliletunusepo.pdfIn PDF document text
    • http://permanentnimakeup-brno.cz/userfiles/files/tumotagifixawezipokuso.pdfIn PDF document text
    • http://ajitcoatings.com/uploads/wosopatidasule.pdfIn PDF document text
    • https://atrax.hr/files/93779520092.pdfIn PDF document text
    • http://biometria.pl/photos_fck/file/98516622589.pdfIn PDF document text
    • http://tunapvietnam.thietbiotoviet.com/Images_upload/files/bikuvunukewujagijesonikov.pdfIn PDF document text
    • http://sieuthivatlieuhoanthien.com/upload/files/lovesafukig.pdfIn PDF document text
    • http://gtlfuelmarine.com/userfiles/file/28852907296.pdfIn PDF document text
    • https://billard-hauri.ch/userfiles/file/vipesotabotuvuvirabe.pdfIn PDF document text
    • http://piqiso.ru/userfiles/file/vutagawo.pdfIn PDF document text
    • http://shangyi-pump.com/uploads/file/12211642108.pdfIn PDF document text
    • http://darec.sk/files/files/78104534465.pdfIn PDF document text
    • http://www.og2c.com/images/file/bebujukolitonufe.pdfIn PDF document text
    • http://noithatlekhanh.com/Images_upload/files/fomiwazetijojo.pdfIn PDF document text
    • https://espaciocultivarte.com/ckfinder/userfiles/files/54862872549.pdfIn PDF document text
    • http://manhchenang.vn/webroot/img/files/86331769560.pdfIn PDF document text
    • http://140.121.180.103/ckfinder/userfiles/files/19016261941.pdfPDF link annotation
    • https://istanajp.com/contents/files/koreger.pdfIn PDF document text
    • http://moscowballet.ru/userfiles/file/vufejewiwikaz.pdfIn PDF document text
    • http://lecostationery.com/files/file/fojipeteveruvogowawuruvol.pdfIn PDF document text
    • https://ihotel2b.com/upfiles/editor/files/75610020138.pdfIn PDF document text
    • http://capmar.eu/userfiles/file/niwegebusizuvusel.pdfIn PDF document text
    • http://tabletopad.com/images/file/55699707452.pdfIn PDF document text
    • http://martom24.pl/martom/userfiles/file/zemixemazumanositidosas.pdfIn PDF document text
    • http://bluebirdcanada.com/FileData/ckfinder/files/20210909_541A5318A5B48C5D.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_off0000b316.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB316 10908 bytes
SHA-256: eb5e6b9280a7830dca8b23b8602d25e421d8e55f817f023f443a18b52b9d5b60
font_01_sfnt_off0000cc4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC4C 15268 bytes
SHA-256: 51e287d8fab19280d57b7bf7f131806b6d849c56b52454d23db25765fab11082
font_02_sfnt_off0000f283.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF283 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1