Malicious PDF — malware analysis report

Static analysis result for SHA-256 e898e1754efb1eb0…

MALICIOUS

PDF

83.3 KB Created: 2021-09-10 04:06:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f58955219a7275dc35d6e8cb19d4266b SHA-1: 6d0d16e207c7540e19841bbb90132a420e86fc10 SHA-256: e898e1754efb1eb005b34a11a030287a891d548bf080368c87d8e0e5b71a51c5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous external URIs, many pointing to disposable hosting, suggesting a link farm designed to redirect users to potentially harmful content. The presence of embedded URLs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicate a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://nomylo.ru/uplcv?utm_term=best+betting+tips+app+on+play+store PDF link annotation
    • https://danielfelber.ch/userfiles/file/tupiwonevowumepikuruxej.pdfIn PDF document text
    • http://master-br.ru/img/file/38637866351.pdfIn PDF document text
    • http://kutscher-customs.de/gfx/userfiles/files/33003427132.pdfIn PDF document text
    • http://kartelabasligi.com/images_upload/files/89045549394.pdfIn PDF document text
    • http://stphilomenaonline.org/userfiles/file/51433468979.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/161394bffcaf99---tesusamepobiluj.pdfIn PDF document text
    • http://newo.ru/files/files/puxasafukumekabo.pdfIn PDF document text
    • https://masini-de-ambalat.ro/images/userfiles/38228407174.pdfIn PDF document text
    • http://fornacedelia.it/userfiles/files/pisagat.pdfIn PDF document text
    • http://3qbuy.com/CKEdit/upload/files/38012865792.pdfIn PDF document text
    • http://skidubravy.sk/spravca/ckfinder/userfiles/files/widogotelebumi.pdfIn PDF document text
    • https://propertiproperty.com/Uploads/userfiles/files/85269990615.pdfIn PDF document text
    • https://anctools.com/ckfinder/userfiles/files/mepipavodanib.pdfIn PDF document text
    • http://www.focitabor.hu/userfiles/file/14211162449.pdfIn PDF document text
    • https://shirbandifelt.com/userfiles/file/153511991.pdfIn PDF document text
    • http://mutamobilya.com/images_upload/files/nikofazuritofamuzuf.pdfIn PDF document text
    • http://elsekmont.eu/userfiles/file/fejivufo.pdfIn PDF document text
    • http://shacklefordlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/95610347198.pdfIn PDF document text
    • http://daeryuhealthcare.com/ckupload/files/42139241942.pdfIn PDF document text
    • https://afgventuregroup.com/cfiles/file/rurug.pdfIn PDF document text
    • https://sanaspinler.com/calisma2/files/uploads/bigoxerugidi.pdfIn PDF document text
    • http://cn-junsheng.com/upload/file///202199124858348.pdfIn PDF document text
    • http://chinamakina.com/userfiles/file/84144592601.pdfIn PDF document text
    • https://tele-video.ru/upload/files/serovud.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_off0000e06e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE06E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f885.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF885 10736 bytes
SHA-256: 6a3dc0394db047e958a3b0cb416df7b675b6f8ac7db1b20388cc76dda9e8d940
font_02_sfnt_off0001112c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1112C 17756 bytes
SHA-256: 0e57fbe57456d2992c045d2f799448866090ffc09c9bc27e6b3e94209bf9efd5

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