Malicious PDF — malware analysis report

Static analysis result for SHA-256 0806e251ed5a21dd…

MALICIOUS

PDF

81.9 KB Created: 2021-09-19 13:29:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: d7382453140b283b6ff89217068157fb SHA-1: 4cbed4779c47f62cf1e14254ea23e722e11c3969 SHA-256: 0806e251ed5a21dd5fd18e256f7a9307b0e78c67a0e64035d1a4afbfb02cead7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to external domains, suggesting it functions as a downloader or redirector. The PDF structure and the presence of embedded URIs strongly suggest it's used in a phishing or malware distribution campaign, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://pixomot.ru/uplcv?utm_term=play+together+unlimited+money+ios PDF link annotation
    • http://klenderbio.com/upload/files/pawabamojuva.pdfIn PDF document text
    • http://gr-chem.com/upload/files/piruvufamosutazabivizi.pdfIn PDF document text
    • https://medtek.vn/storage/file/6532768856.pdfIn PDF document text
    • http://ferien-in-zahren.de/images/file/gapodibarogikifer.pdfIn PDF document text
    • http://www.somdattabasu.com/fckimages/file/fedagimemusetetepeborado.pdfIn PDF document text
    • http://1yunnan.com/ckfinder/userfiles/files/63748522268.pdfIn PDF document text
    • http://baaningdoi.com/file_media/file_image/file/97495390348.pdfIn PDF document text
    • https://mamap.in/ci/userfiles/files/jaxevafulaz.pdfIn PDF document text
    • http://mientaytourist.com/uploads/files/vodiwebunorilufewezetunev.pdfIn PDF document text
    • http://www.eau-msu.ru/ckfinder/userfiles/files/73598928567.pdfIn PDF document text
    • http://intelekt.biz/uploads/pages/files/99434773409.pdfIn PDF document text
    • http://studiogalata.it/userfiles/files/rowekiwugapivududo.pdfIn PDF document text
    • http://yuhao-tech.com/userfiles/file/dojuzukiwaxeb.pdfIn PDF document text
    • http://xn--3bsx3iw22bmot.com/filespath/files/20210904124447.pdfIn PDF document text
    • http://alpinist.store/sribati/editor/uploadfiles/4083224355.pdfIn PDF document text
    • https://www.edm-medical.net/ckfinder/userfiles/files/dofavipatavu.pdfIn PDF document text
    • http://arunimaflavours.com/userfiles/file/12590161970.pdfIn PDF document text
    • http://bakefruit.com/uploads/files/202109051013178688.pdfIn PDF document text
    • http://vipforiraq.com/userfiles/files/17063283050.pdfIn PDF document text
    • http://gibisch.org/files/files/23431015336.pdfIn PDF document text
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/f5fe725371ea04885e714816950f1bf0/31696563777.pdfIn PDF document text
    • https://svenjakretschmer.com/ckfinder/userfiles/files/84548133096.pdfIn PDF document text
    • https://kemxoithanhhang.vn/app/webroot/files/images/pages/files/23729228562.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137da286ca80---zejoxajoxe.pdfIn PDF document text
    • https://landbondcorten.com/attachment/file/1ede1e870bf8301d8fab316d67394955.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_off0000da75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA75 17880 bytes
SHA-256: 59113f38a5eabef53d57c3f830f57ef8643696673ce92cd87216de472f001049
font_01_sfnt_off0001087c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1087C 10912 bytes
SHA-256: d1b7fd1db6194566f480d65f9d1cdd0bdd46475778c0d7147bf037fa789db000
font_02_sfnt_off00012168.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12168 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1