Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd7624afddaf8323…

MALICIOUS

PDF

71.3 KB Created: 2021-09-24 20:42:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 8e1d39e5ccacd79af237f0846772075a SHA-1: aa0b1f8ab11c6d029db64a6f3db9b315da4647ef SHA-256: cd7624afddaf83238f4bfa5313bf68774fe5d4603dc7594549ce524db2a2c5ef
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a high number of external URIs, indicating it's designed to redirect users to potentially malicious websites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The document body is heavily obfuscated and unreadable, providing no direct content clues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://oniceh.ru/uplcv?utm_term=iphone+to+android+phone+transfer PDF link annotation
    • http://pizzeriagiganti.ro/imagini_ws/72489632233.pdfIn PDF document text
    • http://dentali.cz/files/files/fogeletepoguvoxenex.pdfIn PDF document text
    • http://mascotdd.com/file_media/file_image/file/85759635829.pdfIn PDF document text
    • https://xn--b8qxb801j.tw/upload/files/zilowijexinutoxawevu.pdfIn PDF document text
    • http://reflita.lt/uploads/files/sufasenidololobo.pdfIn PDF document text
    • https://atrax.eu/userfiles/file/41939682150.pdfIn PDF document text
    • http://vaynhe.com/upload/files/sekudolokite.pdfIn PDF document text
    • http://geo-equipe.it/userfiles/files/notixusafi.pdfIn PDF document text
    • http://asea-admin.com/_userfiles/file/20210923121439.pdfIn PDF document text
    • http://pc-driver.ru/userfiles/files/53983981725.pdfIn PDF document text
    • https://webaruhaz.codefon.hu/js/ckfinder/userfiles/files/sogufovojilewineni.pdfIn PDF document text
    • http://morecoredesign.com/images/imageUps/files/15168387920.pdfIn PDF document text
    • http://villa-carlshorst.de/sites/default/files/file/54684048208.pdfIn PDF document text
    • http://agriturismoilnoceto.com/userfiles/files/foziriwa.pdfIn PDF document text
    • https://alsultantrading.ae/userfiles/files/77466298104.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145469f49763---jegorevofif.pdfIn PDF document text
    • http://jolanyee.com/upload/files/202109201913467979.pdfIn PDF document text
    • http://talani.nl/userfiles/image/file/xupagoduvepenuku.pdfIn PDF document text
    • http://sibaco.ru/ckfinder/userfiles/files/bilarogivu.pdfIn PDF document text
    • http://bwlpsalisbury.com/uploads/files/basugavoduzibewaje.pdfIn PDF document text
    • http://rem-stroymont.ru/img/file/kadok.pdfIn PDF document text
    • https://moiatakashta.com/userfiles/file/6810366535.pdfIn PDF document text
    • http://stellar.ru/ckfinder/userfiles/files/bazuxugesibaxetimudujuvej.pdfIn PDF document text
    • http://riccaassociati.eu/userfiles/files/56613756964.pdfIn PDF document text
    • http://csc-021.com/userfiles/file/20210923035549_2rozgg.pdfIn PDF document text
    • http://tataservice.it/userfiles/file/selilamobirivosabobam.pdfIn PDF document text
    • http://lso-msm.fr/userfiles/file/ritawuligij.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_off0000b691.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB691 16132 bytes
SHA-256: 4879d339ec1bb29fd559a69aa60057794427abf1934d539332b0fdc7929fd241
font_01_sfnt_off0000defd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEFD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f714.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF714 10500 bytes
SHA-256: 452744c1a96ef05eb73e67cc8efe3864995337a726a4856598aa281755b7e322