Malicious PDF — malware analysis report

Static analysis result for SHA-256 57e3049d87031c88…

MALICIOUS

PDF

86.8 KB Created: 2021-09-16 02:16:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a26fba626b4d4f088ff12beecf67e1d2 SHA-1: 6f838aa25410f978e07c06356f97ce1428687b51 SHA-256: 57e3049d87031c888d6a011f791bed3b1bb58aefc94ce2425f9764bbb05b3ada
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristic analysis identified it as a link farm with numerous external URIs, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of an attempt to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://sergiomauri.com/images/file/binutolomedizuxus.pdf In PDF document text
    • https://phukienbep.net/media/files/62078216701.pdfIn PDF document text
    • http://korsorlampang.net/user_img/files/88073513948.pdfIn PDF document text
    • http://terredellamagnagrecia.com/userfiles/files/43089920508.pdfIn PDF document text
    • http://rallyteamwalraven.nl/file/74868619959.pdfIn PDF document text
    • http://kodemari.info/data/files/44097048415.pdfIn PDF document text
    • http://iranjobex.com/cache/fck_files/file/lawexemikononupofadu.pdfIn PDF document text
    • http://optimumnieruchomosci.pl/uploads/userfiles/files/jozojataregabolabolupoxu.pdfIn PDF document text
    • http://greenmodels.ru/uploads/files/40774884501.pdfIn PDF document text
    • http://zhongjiukeji.com/upload_fck/file/2021-9-5/20210905150704874175.pdfIn PDF document text
    • http://gsprojekt.eu/userfiles/files/18372649838.pdfIn PDF document text
    • https://accidentmatters.com/ckfinder/userfiles/files/vabiwor.pdfIn PDF document text
    • http://ipsgroupjjn.org/userfiles/file/64483987994.pdfIn PDF document text
    • http://perila-vrn.ru/userfiles/file/37883285536.pdfIn PDF document text
    • http://bananamusic.tw/uploads/files/202109111901263864.pdfIn PDF document text
    • http://papierplus.pl/userfiles/file/5220071004.pdfIn PDF document text
    • http://orourkelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/49286072364.pdfIn PDF document text
    • http://ain.proximeo.com/ckfinder/userfiles/files/kerolaxulafebusit.pdfIn PDF document text
    • https://fetogram.ir/images/upload/files/wamitunidow.pdfIn PDF document text
    • http://donkaew-furniture.com/ckfinder/userfiles/files/sodipofeximagobewuwopetas.pdfIn PDF document text
    • http://www.anglometais.com.br/adm/Editor/ckfinder/userfiles/files/64297174769.pdfIn PDF document text
    • https://membermimpi.com/contents/files/24194200270.pdfIn PDF document text
    • https://bakwanudang.com/contents/files/jekevu.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613e51bcc3902---71140895536.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=pandemic+game+androidPDF 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_off0000ecf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECF4 18724 bytes
SHA-256: b4a12831b0a2c0c4ea00be33fa0c265ce2231ff1b643909e82e19171f8fdd6a1
font_01_sfnt_off00011dfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DFA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013611.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13611 10400 bytes
SHA-256: d83c97102a3378423d9afd83b5b44b69edacc898cb9af8c073b6ccc0fe36aacb