Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f13e239ba77f1d8…

MALICIOUS

PDF

72.3 KB Created: 2021-10-03 14:30:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: b60bc8e03161b7b221ef333b1af5ddf5 SHA-1: 943542bd4ba8d9f91d090b5f694764358093b95f SHA-256: 3f13e239ba77f1d8ae8e02dc33198c76e03061589ebaad03f22759a4f0c0e372
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to suspicious domains and are flagged as part of a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or distributing further malware via these links. No scripts were extracted, but the PDF structure itself is indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://leaguengn.com/userfiles/file///52649584171.pdf In PDF document text
    • http://www.fishandcosolicitors.com/uploads/files/96241329057.pdfIn PDF document text
    • http://shengnabei.com/uploadfile/file///2021091121252067.pdfIn PDF document text
    • http://assotechne.eu/userfiles/files/xugapefug.pdfIn PDF document text
    • http://satakantaresort.com/user_img/files/fikojetibug.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/t6rnsj0421rv4a90pmck19emt2/dulaka.pdfIn PDF document text
    • https://hotelmitrutarija.com/uploaded/files/91027367913.pdfIn PDF document text
    • http://csc-0411.com/userfiles/file/20210920162132_r70xo0.pdfIn PDF document text
    • https://www.newhorizonscrisiscenter.org/ckfinder/userfiles/files/fobipe.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/987206d414ae57380420e7eb4913a822/76105661401.pdfIn PDF document text
    • http://naturabliskociebie.pl/userfiles/file/63328151970.pdfIn PDF document text
    • http://art-lan.ru/uploads/assets/file/32832066672.pdfIn PDF document text
    • http://auswallendorf.de/userfiles/file/rogaxivikabej.pdfIn PDF document text
    • http://boxshop.mn/userfiles/files/fisuz.pdfIn PDF document text
    • https://dla-pracownika.pl/pliki_user/File/56975229915.pdfIn PDF document text
    • http://kondicionery-krasnogorsk.ru/upload_picture/file/mumonarupepe.pdfIn PDF document text
    • http://congtrinhnhaviet.vn/upload/files/bovogajemitedikaguxifizex.pdfIn PDF document text
    • http://cestovni-postylka.eu/userfiles/file/zosawi.pdfIn PDF document text
    • http://baovephuongtroi.com/vietkiendo/upload/file/siradidaviva.pdfIn PDF document text
    • http://energy-labels.nl/userfiles/file/95948547825.pdfIn PDF document text
    • https://postelezmasivu-liberec.cz/ckfinder/userfiles/files/mubujezoxesefirukesig.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=divide+sums+for+class+3+with+answersPDF 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_off0000b383.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB383 17836 bytes
SHA-256: 227b4eb4ae054ecf519355babae6899af322b54ad06793e917666702d1d17d24
font_01_sfnt_off0000e170.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE170 11164 bytes
SHA-256: cd1be3719c335c1db94f55cb879ac36a8251670865526cc7dab484011fa184d6
font_02_sfnt_off0000fb75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB75 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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