Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ac218f5c3f454bc…

MALICIOUS

PDF

81.6 KB Created: 2021-10-10 20:14:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: a28349eb48d4cac5696766244a4839e2 SHA-1: 848c275c053b77d705162ce9791c9bc0c5ea7d0a SHA-256: 6ac218f5c3f454bcccff13a5b1684c573db3cf12721dd9d96fa12671a7ff1e5f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains numerous embedded URLs pointing to PDF files hosted on various domains, suggesting a link farm or redirection mechanism. The PDF's structure and the presence of external URIs indicate an attempt to direct the user to potentially harmful content, aligning with phishing or malware distribution tactics.

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://euronuts2009.ge/files/files/jivikit.pdf In PDF document text
    • https://krantiservice.com/ckfinder/userfiles/files/15545078501.pdfIn PDF document text
    • https://fwstc.in/userfiles/file/poxatuvupujivowo.pdfIn PDF document text
    • https://equipelec.fr/ckfinder/userfiles/files/24022927705.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/c437227ad80901d7170e81b5eeae4e3b/55443947029.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/16132cb80f405d---91604225293.pdfIn PDF document text
    • http://flex-link.cn/uploadfiles/files/31959158268.pdfIn PDF document text
    • https://adikkeempat.com/contents/files/25817778799.pdfIn PDF document text
    • http://almar-bus.pl/userfiles/file/34932454041.pdfIn PDF document text
    • https://www.eecpowerindia.com/codelibrary/ckeditor/ckfinder/userfiles/files/nazafolarutegulimarikov.pdfIn PDF document text
    • http://highendschmiede.de/highendfiles/file/dudexodejize.pdfIn PDF document text
    • http://prograsifkalip.com/files/5003512264.pdfIn PDF document text
    • http://akademia-jedenastka.pl/zdjecia/fck/file/78879983556.pdfIn PDF document text
    • http://sicilyontable.it/userfiles/files/9182963234.pdfIn PDF document text
    • http://asu78.ru/userfiles/file/fawigimo.pdfIn PDF document text
    • http://acsalma.hu/userfiles/files/23720743028.pdfIn PDF document text
    • https://study-abroad-travel.com/ckfinder/userfiles/file/xutisaseladulenasewuvevig.pdfIn PDF document text
    • https://iieng.org/editor/ckfinder/userfiles/files/nibozesivesasulijal.pdfIn PDF document text
    • https://jahanchart.ir/data/files/file/lubipa.pdfIn PDF document text
    • http://kanalizace-ul.cz/userfiles/file/13808779330.pdfIn PDF document text
    • https://contemporaryteas.in/admin/uploads/file/51069244559.pdfIn PDF document text
    • https://strechybenesov.cz/content/48212634145.pdfIn PDF document text
    • http://socukorglutamatmentesfuszer.hu/ckfinder/userfiles/files/divovusopenisumudonefux.pdfIn PDF document text
    • https://juhaszautovill.hu/userfiles/file/refuwebapisis.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=corporate+social+responsibility+stakeholdersPDF 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_off0000dbae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBAE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f3c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3C5 10988 bytes
SHA-256: f105acc8764a1e8d6eee5d5aaa62adfa44d9a13edb12567c40257f830d581767
font_02_sfnt_off00010d06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D06 16924 bytes
SHA-256: 6503c5d619c1dec31f0042183f94c682a5a876fe9df1e46167afb637b5d6d0b8

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