Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e37bda09892e9f1…

MALICIOUS

PDF

79.1 KB Created: 2021-09-15 13:56:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 207fd32b03137c42b6e1320bed3e7c46 SHA-1: fa0018e5a95681feb0f09e152eb751d4304b4565 SHA-256: 4e37bda09892e9f1336e0d79628a835646c44324ec2ff671806c5ce0e2b1191c
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 external URIs pointing to various domains, suggesting a link farm or redirection mechanism to distribute malicious content. The PDF structure and embedded URLs are consistent with phishing or malware delivery campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://wastran.ru/uplcv?utm_term=grow+followers+mod+apk PDF link annotation
    • https://nikolsbeauty.com/webroot/f/uploads/file/gunuzofujivubegama.pdfIn PDF document text
    • https://www.tyrtaios.gr/ckfinder/userfiles/files/jewidawipolusutekuvow.pdfIn PDF document text
    • https://foodsafebox.com/ckfinder/userfiles/files/54859985984.pdfIn PDF document text
    • http://magooferta.pl/uploads/fck/file/luvadenemetozez.pdfIn PDF document text
    • http://riskhedgetech.com/uploaded/file/177663535561394ca24513a.pdfIn PDF document text
    • http://excitechem.com/userfiles/file/moxedonagazokufogulisit.pdfIn PDF document text
    • http://schodylux.pl/userfiles/file/nukixiwepakadowa.pdfIn PDF document text
    • http://sun-eko.eu/files/file/judulavedokimufukexumed.pdfIn PDF document text
    • http://dalieuht.com/app/webroot/uploads/files/nuvobejavemalidav.pdfIn PDF document text
    • https://12shio2.com/contents/files/2522935391.pdfIn PDF document text
    • https://ubk-sad.de/azubi/userfiles/files/zejimot.pdfIn PDF document text
    • http://www.logistiekverbeteren.nl/ckfinder/userfiles/files/jisek.pdfIn PDF document text
    • https://www.jdconstinc.com/ckfinder/userfiles/files/nikepizidunevomor.pdfIn PDF document text
    • http://dynamic1984.com/user_file/file/kanikomisanivarasegi.pdfIn PDF document text
    • https://palcev.ru/userfiles/file/60653215827.pdfIn PDF document text
    • https://efsanepin.com/calisma2/files/uploads/47529055205.pdfIn PDF document text
    • https://namphuctourist.com/userfiles/file/lolugemenavu.pdfIn PDF document text
    • https://bywuf.org/upload/editor/files/24806515458.pdfIn PDF document text
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161413de7602d7---rerefasagikum.pdfIn PDF document text
    • http://honeycontacts.com/uploades/userfiles/file/22249794739.pdfIn PDF document text
    • http://hatowo.com/app/webroot/uploads/files/52643248478.pdfIn PDF document text
    • http://2ds-creations.fr/userfiles/file/samepadojopoka.pdfIn PDF document text
    • http://deltools.com/userfiles/file/47879737837.pdfIn PDF document text
    • https://healthmatters.me/userfiles/file/nuzugazaxazunokuroxaroli.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_off0000d23c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD23C 17280 bytes
SHA-256: 5821f873b7661960c4ad25803561131d211afa5217bd97c2c4c181fd3e1c2af0
font_01_sfnt_off0000fec1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEC1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000116d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116D8 10580 bytes
SHA-256: 789a6fb7349429b9785a4f9709a73933117d304c5d2d46c9f1c05214711e09b9

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