Malicious PDF — malware analysis report

Static analysis result for SHA-256 4531740c4d2f42eb…

MALICIOUS

PDF

85.5 KB Created: 2021-09-08 17:34:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: b15a18d45062be76489effd73e623447 SHA-1: bd1d5b2734f3872dd5fee8387f28cfaa174eba80 SHA-256: 4531740c4d2f42eba64f77a6e5929b40261fd1706a97f7b30509959d50617be3
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are part of a link farm designed to obscure the final malicious destination. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates this behavior, and the ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the structure points to a malicious document designed to trick users into downloading a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://alles-vom-schreiner.de/userfiles/file/97769849508.pdf In PDF document text
    • http://pickup-ws.com/userfiles/files/firuzipafikutejijuw.pdfIn PDF document text
    • https://gotoko.com/cmsv2/upload/files/77253015363.pdfIn PDF document text
    • http://maginsaatmetal.com/resimlerfiles/pororojofowazatozilusajo.pdfIn PDF document text
    • http://bloomx.com/sites/all/sites/bloomx.com/files/93662127126.pdfIn PDF document text
    • https://institut-arabe.org/ckfinder/userfiles/files/86713260263.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16137e88e47692---86661725880.pdfIn PDF document text
    • http://unicorn-furnitures.com/d/files/73086243145.pdfIn PDF document text
    • http://ssatripoli.org/userfiles/file/79558688815.pdfIn PDF document text
    • http://c-six.it/userfiles/files/foxurixexapixedizisugol.pdfIn PDF document text
    • http://studioassociatoemc.com/userfiles/files/lixebed.pdfIn PDF document text
    • https://harmony.im/userfiles/file/52395374834.pdfIn PDF document text
    • http://inoxbienhoa.com/upload/files/murixoveritig.pdfIn PDF document text
    • http://drivescuolaguida.it/userfiles/files/xekitubasamuzejuwiko.pdfIn PDF document text
    • http://enslev-anlaegsservice.dk/userfiles/file/24001848718.pdfIn PDF document text
    • https://lapakunited.com/contents/files/77580040172.pdfIn PDF document text
    • http://win-sonic.com/ck_imgs/files/60037142136.pdfIn PDF document text
    • http://rlmlaw.com/images/edit_images/file/kovoxoporijopalogoj.pdfIn PDF document text
    • http://vansuloi.com/uploads/userfiles/file/sopewunajitokivoxe.pdfIn PDF document text
    • https://tsegypt.com/file/jaziferatolonaxuribijesa.pdfIn PDF document text
    • http://xfswchem.com/upload/files/84335665718.pdfIn PDF document text
    • http://xn--tnqz8hz5cb8l.com/upload/files/lejalesabilawufupi.pdfIn PDF document text
    • http://pokrowce-ochronne.pl/Upload/file/40243334396.pdfIn PDF document text
    • http://jujucuisine.com/userfiles/file/97563114050.pdfIn PDF document text
    • https://shriramsteels.in/public/ckfinder/userfiles/files/56106669893.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=9th+standard+konar+tamil+guide+pdfPDF 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_off0000e500.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE500 18908 bytes
SHA-256: 8322300bddd358c2fad87faa18b2eafa9b76289eddcd72aebca5897ccea68ff6
font_01_sfnt_off0001164e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1164E 11208 bytes
SHA-256: 763c9d5bbe3ce5e2e9928bfcb1cc585fbc78725d882cc6d1934af01746ff7309
font_02_sfnt_off00013022.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13022 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1