Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd3d926d5f91c728…

MALICIOUS

PDF

83.0 KB Created: 2021-11-13 18:04:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: a6fe9416be78fe4c0f97e04cb345f9e7 SHA-1: 73187c944b4df9c9c2f4ec00821bfae43ae18523 SHA-256: dd3d926d5f91c7286d8da4455bb0562605dcbe73205d5ab6db3ea700c5b716d1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating it functions as a link farm. Multiple embedded URLs point to domains that host PDF files, suggesting a phishing or redirection scheme. The document body is heavily obfuscated and appears to be generated content rather than user-readable text.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://sntaviator.ru/ckfinder/userfiles/files/bagezibunorune.pdf In PDF document text
    • https://tfpac.com/nbloom/fckuploads/file/6079730632.pdfIn PDF document text
    • https://ochronaskory.pl/pliki_user/File/37238831368.pdfIn PDF document text
    • http://makeyourpartnermelt.com/userfiles/file/19485983195.pdfIn PDF document text
    • https://dennismaloney.ca/upload/editor/file/lizekulof.pdfIn PDF document text
    • http://knshzj.com/CKEdit/upload/files/sobemababuw.pdfIn PDF document text
    • http://studio-rivetti.it/userfiles/files/xisebukitegemi.pdfIn PDF document text
    • http://360global.ca/userfiles/file/37753590814.pdfIn PDF document text
    • https://thediamangroup.com/_images/files/70362020931.pdfIn PDF document text
    • https://philly.drinkpoint.com/uploads/files/82269529458.pdfIn PDF document text
    • https://franchise-vietnam.com/app/webroot/img/files/gitexabibe.pdfIn PDF document text
    • https://behagi.eus/files/galeria/files/8502380454.pdfIn PDF document text
    • http://jjburgerut.com/uploads/files/tuwesobotigopavunanakom.pdfIn PDF document text
    • http://hmconcretemixingplant.ru/d/files/94594620919.pdfIn PDF document text
    • http://urbancollab.com/userfiles/Proj_Name/files/44696727637.pdfIn PDF document text
    • http://kimhoatra.com/upload/fckimagesfile/lesol.pdfIn PDF document text
    • http://www.florentmaussion.net/userfiles/File/10349779223.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/161484ade494ce---xemorofamujog.pdfIn PDF document text
    • http://dialog-seversk.ru/jsplugins/ckfinder/userfiles/files/65536738540.pdfIn PDF document text
    • http://tries.cz/media/images/upload/file/73468668011.pdfIn PDF document text
    • http://mwbright.com/upload_fck/file/2021-9-11/20210911090121251408.pdfIn PDF document text
    • http://sartor.ru/upload/files/litopubokeniz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Gsjc/~3/5bhJmFgkeCE/uplcv?utm_term=cooking+with+fresh+eggsPDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16186dbc68c3ff---10151604323.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_off0000e194.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE194 17660 bytes
SHA-256: ccd8992241dce868b5ab2736b25a42d89a24d9e7aa804490895609fc8894996d
font_01_sfnt_off00010f6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F6C 10492 bytes
SHA-256: 7cd9790b5b8e4dde65bedc225d3a9cf2f252b3c8c95ef2b22b70b511228634ae
font_02_sfnt_off0001275b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1275B 16540 bytes
SHA-256: 45015263e28dbf00792e0fa83ae0fb9123af5110209f191c00797c49350166ef