Malicious PDF — malware analysis report

Static analysis result for SHA-256 4889d75d562f2752…

MALICIOUS

PDF

67.9 KB Created: 2021-09-13 14:47:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: fbd8e9f48ba137078f6503a36074d423 SHA-1: 8594f7ee4a7b9c4badc8f65c094bfb04041da39d SHA-256: 4889d75d562f275237f8584faad4aaeb01972254e207f847a0f2f8849c43e230
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous embedded URLs that form a link farm, suggesting an attempt to direct users to potentially malicious sites. The PDF structure and heuristic firings indicate it is designed to exploit vulnerabilities or trick users into downloading further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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 http://zrdb-drogbud.pl/Upload/file/30370532223.pdf In PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/83a0qo1mfosdo3vavijpp435j3/nuxafet.pdfIn PDF document text
    • http://synthecinter.com/userfiles/files/21390240761.pdfIn PDF document text
    • http://mirsistem.com/depo/sayfaresim/file/3607401197.pdfIn PDF document text
    • http://hotdeals24x7.com/ci/userfiles/files/41058032273.pdfIn PDF document text
    • http://7166867.ru/ckfinder/userfiles/files/febovisegatij.pdfIn PDF document text
    • http://centroolosprato.it/userfiles/files/pudemi.pdfIn PDF document text
    • http://naturallabs.de/userfiles/file/25871953247.pdfIn PDF document text
    • http://randoquad72.fr/userfiles/file/86987170981.pdfIn PDF document text
    • http://dfwarbitrator.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/migabotufifepurizaz.pdfIn PDF document text
    • http://zerosquareonline.com/file/renurom.pdfIn PDF document text
    • http://iact2001.com/userData/board/file/40916136944.pdfIn PDF document text
    • http://xinyuemu.net/assets/202109/files/20210912173452647807.pdfIn PDF document text
    • http://martom24.pl/martom/userfiles/file/zujowewiko.pdfIn PDF document text
    • http://inannamsao.com/uploads/files/28597513035.pdfIn PDF document text
    • https://lensprovn.com/ckfinder/userfiles/files/wujifavogaronoxu.pdfIn PDF document text
    • https://fiberglasssupplydepot.com/userfiles/files/jilowuwelubulose.pdfIn PDF document text
    • https://cfacgroup.com/uploads/FCK_files/file/45229643404.pdfIn PDF document text
    • http://fotografoenricogiampieri.it/userfiles/files/wewutimirigo.pdfIn PDF document text
    • https://sanmuabancongty.vn/images/content/files/19289387360.pdfIn PDF document text
    • http://apicn.net/upload/files/61777129876.pdfIn PDF document text
    • http://satthachkhe.vn/image/file/6633769577.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=dls+19+obb+zip+filePDF 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_off0000ae07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE07 10308 bytes
SHA-256: 33aa42036f76b3183b4c69c18505278c7916565c8681f447de46b399becdc1e9
font_01_sfnt_off0000c53b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC53B 14852 bytes
SHA-256: 22f958a56be1848849f27db5af389bd45d2c32bcd49f3245b374e1eaac0bc8b4
font_02_sfnt_off0000eaa5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAA5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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