Malicious PDF — malware analysis report

Static analysis result for SHA-256 1590a227ed5fafb8…

MALICIOUS

PDF

78.9 KB Created: 2021-09-19 04:23:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 60691348997688c840a5f821a4583fbb SHA-1: e83ffd9a118ba41b7154e5e194664159221fe3a5 SHA-256: 1590a227ed5fafb80dda6714e95c7d964005b917baf855d498029bd3e0c38dce
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URLs, many of which are hosted on disposable domains, indicating a link farm designed to obscure the ultimate destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document, potentially leveraging embedded JavaScript for malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://garglob.ru/uplcv?utm_term=prince+of+persia+for+android+download PDF link annotation
    • http://first-group.kr/ckupload/files/rosiweni.pdfIn PDF document text
    • https://goodmix-psc.com/userfiles/files/97709571101.pdfIn PDF document text
    • http://affectif.ro/data/Image/file/33546850970.pdfIn PDF document text
    • http://hasicimosnov.cz/foto/Image/file/75550819358.pdfIn PDF document text
    • http://theprofitnesstrainers.com/userfiles/file/16155010427.pdfIn PDF document text
    • https://123natura.com/stockages/files/gemob.pdfIn PDF document text
    • http://besteva.com/upload/files/juxirifasezo.pdfIn PDF document text
    • https://bizimpin.com/calisma2/files/uploads/bazabo.pdfIn PDF document text
    • http://tochalco.com/uploads/files/97473434807.pdfIn PDF document text
    • http://ciba.lv/uploaded/file/lovitevuda.pdfIn PDF document text
    • http://air-ned.com/uploads/files/gugobawos.pdfIn PDF document text
    • https://mtydizayn.com/userfiles/file/46645640956.pdfIn PDF document text
    • http://gamebonda.com/ckupload/files/53658182561.pdfIn PDF document text
    • https://laatjehuisweerstralen.nl/upload/file/34173470827.pdfIn PDF document text
    • http://33podarka.ru/pictures/files/25394704147.pdfIn PDF document text
    • http://meble-tk.pl/userfiles/file/navuzip.pdfIn PDF document text
    • https://betenagro.com/sites/default/files/file/49933748247.pdfIn PDF document text
    • https://kccegis.com/upfiles/content/file/20210906185852.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/16144ae4e74611---zunukulukivajesebadaveje.pdfIn PDF document text
    • http://boletos.luzservicos.com/ckfinder/userfiles/files/wewilevaxe.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_off0000ce7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE7A 10604 bytes
SHA-256: 63f4854ba4f179b61692c5df765ef5381cd7690220fe76e3f8f84231429d2a4c
font_01_sfnt_off0000e6d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6D1 18200 bytes
SHA-256: ee13f2a2b2ab0ec07efe746c284c7fdd432b2f3234fdcdf0ba835602e52beb26
font_02_sfnt_off00011623.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11623 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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