Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7a2aa45fce7f27e…

MALICIOUS

PDF

70.6 KB Created: 2021-10-04 00:07:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: fb2a1b41e9f004499c8cfa7fd3cde26d SHA-1: 94c7059a0f598f90b57aa8a7d72bcc958b990caa SHA-256: f7a2aa45fce7f27e3b5a31a4447f4394b373b633b79442f51f6b51f210fa5e2c
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, with heuristics indicating embedded JavaScript and external URI redirection. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests a large number of links to disposable domains, indicating a likely phishing or spam campaign. The embedded JavaScript is the primary mechanism for executing malicious actions, such as redirecting the user to one of the numerous listed URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://garglob.ru/uplcv?utm_term=elevated+red+blood+cells+hemoglobin+and+hematocrit PDF link annotation
    • http://geraldinekilkelly.ie/topon.pdfIn PDF document text
    • http://www.stemcellhairclinic.com/files/files/87905708034.pdfIn PDF document text
    • http://garage-ys.info/js/upload/files/vojonowuxomexuboruzutuvo.pdfIn PDF document text
    • https://soccerauquebec.com/userfiles/file/87280525102.pdfIn PDF document text
    • http://cee1968.com/ckfinder/userfiles/files/gitaziganof.pdfIn PDF document text
    • https://optimuselearningschool.com/learning/site/images/uploadfiles/duvarit.pdfIn PDF document text
    • https://inc.pamlskovnik.cz/ckfinder/userfiles/files/29440006145.pdfIn PDF document text
    • http://askort.pl/Upload/file/92627674853.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/01f3e390f6de7b1dce7cf242ba3af12d/vusuxifusofixasidu.pdfIn PDF document text
    • https://melnikhouse.com/userfiles/file/nasuxideton.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///23979252605.pdfIn PDF document text
    • https://tainandentist.com/uploads/files/202109080443246323.pdfIn PDF document text
    • https://lixtech.com.tw/ckfinder/ckfiles/files/supifizagixegumama.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/jjhnt4t9iqavhp1nohl9he76ok/mokowaxizoludomojusimunin.pdfIn PDF document text
    • https://arbormaster.net/uploads/files/47011665650.pdfIn PDF document text
    • http://kpdb.org/userfiles/files/75241702977.pdfIn PDF document text
    • http://tabletopad.com/images/file/gumizavexunolemegelowiji.pdfIn PDF document text
    • http://www.kotolantopeni.cz/files/43059613067.pdfIn PDF document text
    • http://xn----7sbezcba9a5aggb3j.xn--p1ai/ckfinder/userfiles/files/tufogutasanur.pdfIn PDF document text
    • https://clickbox.ro/images/file/koposawomozurob.pdfIn PDF document text
    • http://angerdress.store/ckfinder/userfiles/files/gelijopotakejenip.pdfIn PDF document text
    • https://rheinfurth.de/userfiles/file/pazazoxinexivigos.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_off0000b001.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB001 17012 bytes
SHA-256: 57899f13cb7d1e5127c48bf626faf8f174542902bc2992ba3e489b87a2c38aad
font_01_sfnt_off0000db3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB3A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f351.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF351 11004 bytes
SHA-256: 5cd4b7ee707217e6c8300c3c11e71c9a4df92b8590d2f5b3b29bf408bb165206

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