Malicious PDF — malware analysis report

Static analysis result for SHA-256 24d924e897aa77b5…

MALICIOUS

PDF

79.3 KB Created: 2021-09-17 10:57:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3f972d2ffcafe40883cf12276e2f0645 SHA-1: 28f1e55412b5e8594a13a85818d995814e7eb972 SHA-256: 24d924e897aa77b5d9cc6642610714d8aca5bfe9d526e45ddb34930525da486e
214 Risk Score

Malware Insights

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

This PDF contains embedded JavaScript and multiple external URIs, some pointing to raw IP addresses, which is indicative of malicious activity. The heuristics suggest it functions as a link farm and potentially a callback phishing lure, aiming to trick users into downloading further malicious content. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 9

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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 http://140.121.180.103/ckfinder/userfiles/files/58088781378.pdf PDF link annotation
    • http://cdkuysuujk.handysociality.com/upload/files/26077978384.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/watuvegoteli.pdfIn PDF document text
    • https://ms01bet.com/contents/files/neridufapo.pdfIn PDF document text
    • https://transturist.ba/ckeditor/ckfinder/files/files/76422228812.pdfIn PDF document text
    • http://dc-a0dcf319a153.breakthroughsport.com/userfiles/files/kewuborogumepenenex.pdfIn PDF document text
    • http://st03.it/userfiles/files/gavawuporox.pdfIn PDF document text
    • http://kidneytracker.com/ckfinder/userfiles/files/puverekumubajima.pdfIn PDF document text
    • https://muahohangnhat.com/app/webroot/uploads/files/sijoxamenop.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613939d29c9e8---kuzato.pdfIn PDF document text
    • http://ddservice-bmw.pl/userfiles/file/sikezukubamaletuxareji.pdfIn PDF document text
    • http://kubkao-kubpla.com/userfiles/files/fepamorunukikurijuditipe.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/kavekosipepazedawem.pdfIn PDF document text
    • http://mmprogetti.it/userfiles/files/tafelefujixifejufiki.pdfIn PDF document text
    • http://hopkim.vn/upload/files/wavamabalogowesejexexerej.pdfIn PDF document text
    • http://architectureanddesign.it/userfiles/files/19011029106.pdfIn PDF document text
    • http://dezis.ru/uploads/files/wuvemimorabet.pdfIn PDF document text
    • https://mavibusiness.it/file/goragowuzixotilo.pdfIn PDF document text
    • http://land89.com/ckupload/files/48922092978.pdfIn PDF document text
    • https://ev-owners.jp/userfiles/files/wakogu.pdfIn PDF document text
    • https://escolaalfa.com/userfiles/file/33503948229.pdfIn PDF document text
    • http://rhondachem.com/d/files/keboxisazorifirilixemu.pdfIn PDF document text
    • http://lngpetro.com/userfiles/file/96107996426.pdfIn PDF document text
    • http://aluminial.pnh.pt/js/ckfinder/userfiles/files/niwutuvanafomi.pdfIn PDF document text
    • http://wdnederland.nl/file/35142105252.pdfIn PDF document text
    • http://kxxbs.com/uploadfiles/file/a/zumulikokabavexutavamun.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=wwe+2020+apkPDF 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_off0000cd03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD03 9932 bytes
SHA-256: 9c1a7334f1ed2c27a9b6b17f4df69157120857e06528156cba0de1800a3ea182
font_01_sfnt_off0000e32f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE32F 20288 bytes
SHA-256: 5ad5fb30a4790c7e678a1ef5ce4afb94956c50773d48c391b6964946191d2557
font_02_sfnt_off0001180c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1180C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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