Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c48b48eaf4a610b…

MALICIOUS

PDF

80.6 KB Created: 2021-09-18 18:04:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 494a2e36be152e0942989bcb73b4b897 SHA-1: ec959545355740940504e80fe77e80d2d5ed59e3 SHA-256: 0c48b48eaf4a610b9823a0b1dd60727392480c5cead8051ab8e03910704c63a1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://archism.ru/uplcv?utm_term=how+to+see+post+of+private+account+without+following+in+instagram PDF link annotation
    • http://giasuminhtam.com/Images_upload/files/fuvuwuwilumafopumowi.pdfIn PDF document text
    • http://airelimpio.mx/img/editor/file/35037345355.pdfIn PDF document text
    • http://i-daa-wl.de/userfiles/40828125689.pdfIn PDF document text
    • http://www.heksan.com.pl/file/dodowuvale.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f0f54874dc---tadiboxek.pdfIn PDF document text
    • http://www.novosib-sport.ru/ckfinder/userfiles/files/6946115015.pdfIn PDF document text
    • https://partnyor.az/userfiles/file/vewunubetiko.pdfIn PDF document text
    • http://nppgursaraijhansi.in/ckfinder/userfiles/files/baxapigaxafadow.pdfIn PDF document text
    • http://brukikostka.pl/uploads/page/file/golebixunanulube.pdfIn PDF document text
    • http://pibar.tw/uploads/files/202109101624319255.pdfIn PDF document text
    • http://griesvoegwerken.nl/UserFiles/file/dovujiduvidusoririkeja.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/3vht99f5esor824rp6mmdglggr/lenokam.pdfIn PDF document text
    • http://ocean-ex.com/images/blog/file/ruwugagu.pdfIn PDF document text
    • https://lotte-ppta.net/beta/assets/file/29832511803.pdfIn PDF document text
    • https://5a.ro/ckfinder/userfiles/files/61708374602.pdfIn PDF document text
    • http://www.s4b.nl/upload/files/1310894058.pdfIn PDF document text
    • http://trungtamdaykem.vn/Images_upload/files/90652940186.pdfIn PDF document text
    • http://www.uc-kushiro.net/images/library/File/60982157815.pdfIn PDF document text
    • http://sensi-leszno.pl/userfiles/file/dubakelozopeluzemeb.pdfIn PDF document text
    • http://wenyanchem.com/upload/files/xotonerumekodo.pdfIn PDF document text
    • http://splogservice.ru/content/file/palusatesivujowokevixebex.pdfIn PDF document text
    • https://junona.manyel.website/images/uploads/medium/98093793578.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_off0000d36b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD36B 18272 bytes
SHA-256: 4788880e119f8c68e48c752e367807496485927a9b682b700e70ba3ff8c0df86
font_01_sfnt_off00010285.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10285 11168 bytes
SHA-256: c75eb2b234a8a7b9176d6368a1695e9b0c0fa5af7cb8b085ec546e35c08176bb
font_02_sfnt_off00011c7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C7D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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