Malicious PDF — malware analysis report

Static analysis result for SHA-256 db0bb168c3db8967…

MALICIOUS

PDF

82.9 KB Created: 2021-09-24 03:49:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8803dbcf82df9114631b30f33c17eda4 SHA-1: 80c5e592647cc30db50ef3d2e8f66fd9e244c0a8 SHA-256: db0bb168c3db89678bf3ce330a1fc6bf848c19ecc7fbc866a8b4453c036e1435
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of numerous embedded URLs, many pointing to potentially disposable domains, suggests a link farm designed to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://praktijk-fix.nl/userfiles/image/file/tunefuravofasuwowofezez.pdf In PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130827b75df6---88417376828.pdfIn PDF document text
    • https://anhhuynoithat.com/asset/files/77008015120.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/ef68518d9faca7cda7a8409487b2af2b/86823347169.pdfIn PDF document text
    • https://vgi-vn.vn/app/webroot/img/files/pawipevowasewiwinar.pdfIn PDF document text
    • https://bruceleevideos.org/images/file/26460001777.pdfIn PDF document text
    • http://tevukasveza.lt/ckfinder/userfiles/files/poveramesiwubajar.pdfIn PDF document text
    • http://worldtile.net/jangheung/userfiles/file/kegufuripilif.pdfIn PDF document text
    • http://style4.allwebeasy.com/userfiles/files/xugobibomop.pdfIn PDF document text
    • http://kehlux.lu/userfiles/files/kizovujafi.pdfIn PDF document text
    • http://prochem.vn/images/uploads/files/40192878481.pdfIn PDF document text
    • https://traiteur-troyes-mariage-buffet-aube-10.blaisot-traiteur.fr/ckfinder/userfiles/files/78407663099.pdfIn PDF document text
    • http://techcessgroups.com/userfiles/file/pefupenuzevedukevidisiru.pdfIn PDF document text
    • http://salukool.ee/upload/userfiles/file/zotidup.pdfIn PDF document text
    • http://ohmytour.kr/FileData/ckfinder/files/20210908_66E9B1E108DEE3CB.pdfIn PDF document text
    • http://rebeccafantarchitetto.it/userfiles/files/86243624619.pdfIn PDF document text
    • https://baigiangtoanhoc.com/upload/files/dimexowojavelajuwizinit.pdfIn PDF document text
    • https://behagi.eus/files/galeria/files/pevidofejoremap.pdfIn PDF document text
    • http://www.rosabrockenhaus.ch/ckfinder/userfiles/files/zomunivulojimetotezefomil.pdfIn PDF document text
    • http://space-edge.com/upload/files/26648026051.pdfIn PDF document text
    • http://findusafranchise.com/files/files/wamovonalufafomoxen.pdfIn PDF document text
    • https://kristaldicarlo.com/userfiles/file/sasipupuj.pdfIn PDF document text
    • http://studiomilano.eu/userfiles/files/mugonutemiji.pdfIn PDF document text
    • https://abisspaandboutique.com/nbloom/fckuploads/file/kuxikuvigodanarimazomom.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/files/52494261975.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=emulator+games+ndsPDF 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_off0000dfc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFC3 18196 bytes
SHA-256: f62aafcbd93431352c2d996e6e894ccd192045c068890553d577ed6734e98e82
font_01_sfnt_off00010e68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E68 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001267f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1267F 10580 bytes
SHA-256: cadf639dc8a3166c56eda62726aced16514ffcae177d3f5b9ae34df0c6ea866d