Malicious PDF — malware analysis report

Static analysis result for SHA-256 391047fdb45bffae…

MALICIOUS

PDF

84.2 KB Created: 2021-09-17 15:13:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 46aef1322f523bdb1ba3aabdbb3f0f11 SHA-1: 0c87ea1ebbca244304ea480890ebc90fa0be6f35 SHA-256: 391047fdb45bffae0572d64ccd169f3f5e6c733c22d892b9619c3ba9a580e722
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to external domains, suggesting it functions as a link farm or phishing lure. The PDF structure and embedded content, despite being heavily obfuscated, are consistent with attempts to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://catamma.ru/uplcv?utm_term=parallel+apps+in+android PDF link annotation
    • http://josephfellerlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/winizerotiluluvuzosa.pdfIn PDF document text
    • http://rialta.ie/userfiles/files/refofisorexomufikivebe.pdfIn PDF document text
    • https://get-insurance.in/ckfinder/userfiles/files/wizusuraburetawofexarex.pdfIn PDF document text
    • https://mobile-translator.eu/app/webroot/media/files/99763168501.pdfIn PDF document text
    • http://klick-tipp.at/ckfinder/userfiles/publics/files/6679382799.pdfIn PDF document text
    • https://ppkh.net/userfiles/file/14505251075.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16134aec064ea2---lijesevopasizane.pdfIn PDF document text
    • http://cutyoursupport.com/userfiles/file/24743436763.pdfIn PDF document text
    • http://e-kva.ru/admin/ckfinder/userfiles/files/3342475810.pdfIn PDF document text
    • http://sooclose.eu/upload/File/71378660804.pdfIn PDF document text
    • http://votava2.altrodesign.eu/ckfinder/userfiles/files/rivatit.pdfIn PDF document text
    • http://cybernet-ap.com/UserFiles/File/gerolitivuzaromuve.pdfIn PDF document text
    • http://xfswchem.com/upload/files/zofegenupepiluralob.pdfIn PDF document text
    • http://kolaykanal.com/userfiles/files/75165661923.pdfIn PDF document text
    • http://merlegdoktor.hu/tmp/kujototezatas.pdfIn PDF document text
    • http://djpress.pl/Image/files/zizilexotukekutemisiron.pdfIn PDF document text
    • https://bnbcostaverde.it/userfiles/file/najikekabajiraj.pdfIn PDF document text
    • http://hepiran.com/cache/fck_files/file/12396127991.pdfIn PDF document text
    • http://palaciodelosnavas.com/userfiles/file/20853818014.pdfIn PDF document text
    • http://choragwica.pl/userfiles/file/56725841425.pdfIn PDF document text
    • https://louvre.lv/res/wysiwyg/file/528604679.pdfIn PDF document text
    • https://khabul.mn/mmpa/userfiles/files/53280013044.pdfIn PDF document text
    • https://www.fangjin.org/ckfinder/userfiles/files/sudogabidufofemupaf.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_off0000e513.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE513 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fd2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD2A 10288 bytes
SHA-256: 9135f0d4b010307d188a8c72a248726b3d00582baca54be72cd6aeedb55926b3
font_02_sfnt_off00011456.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11456 18056 bytes
SHA-256: c5a23033211ed47a622c9354c787532329db07d1ddaf5e2bcf51a9bc464320b9

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