Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b7ee83fd9f8d688…

MALICIOUS

PDF

85.2 KB Created: 2021-01-17 03:57:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 7ba2157ded72f1843f5ce6d8e80ef1a4 SHA-1: e855b86919b5e2d2c28a46923e37d6e2f996f195 SHA-256: 9b7ee83fd9f8d68817dc9a69191c373fd05fcfa2097ff12a485d85a55a3c533e
214 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://gettraff.ru/123?utm_term=bajar+m%25C3%25BAsica+gratis+de+banda+machos In PDF document text
    • https://site-1177153.mozfiles.com/files/1177153/xewuremurumosadegirufiw.pdfIn PDF document text
    • https://denapifikuzo.weebly.com/uploads/1/3/4/6/134634031/50e40787a751f4.pdfIn PDF document text
    • https://site-1176492.mozfiles.com/files/1176492/jarujofopepukomu.pdfIn PDF document text
    • https://ronurakegilapoz.weebly.com/uploads/1/3/4/8/134852428/virumuzuxi_felozuvo.pdfIn PDF document text
    • https://cdn.sqhk.co/rilowikapaz/2O1Jnlx/99499084570.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/ribowexulo/argo_full_movie_hd.pdfIn PDF document text
    • https://s3.amazonaws.com/sasufufa/murikovinorukof.pdfIn PDF document text
    • https://s3.amazonaws.com/lorifawuvawot/kowisibimuwex.pdfIn PDF document text
    • https://s3.amazonaws.com/kigavanus/stranded_isle_game.pdfIn PDF document text
    • https://s3.amazonaws.com/punagilelabon/acc_aha_guidelines_atrial_fibrillation_2019.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d673.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD673 6440 bytes
SHA-256: a606a6dede3b99472d2ac97761204782646b5f75106b48d1abccbe9a99ca9a4c
font_01_sfnt_off0000e667.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE667 5700 bytes
SHA-256: 8661a9067ff5675dfda84b1989cc85bd384c78b5b630695d842c2f33851aa607
font_02_sfnt_off0000f95c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF95C 3012 bytes
SHA-256: 77b470ed89a1d27c368b2f2050a60cfbf967bb949fda6ccaa84bfb95fb0bf793
font_03_sfnt_off000104d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104D9 11932 bytes
SHA-256: 904690a8685f04b02fe42699091478f5bb402f11188a214bb19a36b4bcc6c063
font_04_sfnt_off00012b43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B43 18000 bytes
SHA-256: b460af76fbb4e6047ebc96bed71fe3738fc5341f075552939b381883eea5e7e2

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