Malicious PDF — malware analysis report

Static analysis result for SHA-256 834ba283b72be2b9…

MALICIOUS

PDF

81.9 KB Created: 2020-11-18 09:34:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: ae713516556bf893138ca35799b83234 SHA-1: d9d150f9d717f5cec6b94229c6af31ea7dcb4777 SHA-256: 834ba283b72be2b99cdaa9739c818a174a422311daae521122c685d1edb62f15
156 Risk Score
Tags
free-cdn-ebook-manual-lure

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. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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
  • 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.
  • 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://trafffi.ru/strik?utm_term=descargar+musica+gratis+delos+tucanes+de+tijuana PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4372384/normal_5f97120b1fc4f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383582/normal_5fa04545f0c6a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481157/normal_5fad92b2a57c9.pdfIn PDF document text
    • https://tenabawik.weebly.com/uploads/1/3/2/7/132710661/juterunarifidoxojek.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370542/normal_5f8bf3bd619df.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375525/normal_5f8f2ca3135df.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447270/normal_5f9f8219d3810.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388815/normal_5fb37518a54b2.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/felasorarabipis/zukaziteg.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9f9665c4-a5db-4c86-939a-0c0acdc2756e/philips_magnavox_universal_remote_control.pdfIn PDF document text
    • https://s3.amazonaws.com/julexekubaj/lady_antebellum_need_you_now.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_off0000cdb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDB9 6440 bytes
SHA-256: 3d4760ca295192c89086870ebbac49c5a5945404ea6ab57fca452cf2db5f569a
font_01_sfnt_off0000dd7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD7C 2908 bytes
SHA-256: 27cd98d624e66b628b822658e5540d5a2ad313e0d5fe492dcb0485b971005437
font_02_sfnt_off0000e7d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7D9 5332 bytes
SHA-256: 2806dfe809ed19802ff733adf78f1386fa5af261926b21d8fdab46897731c46d
font_03_sfnt_off0000f9ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9ED 11936 bytes
SHA-256: 4ae542c1b95eb6b6a13524b86ebb9753749c4999402a7d1fcc4a54dfc8c19a2d
font_04_sfnt_off00012001.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12001 17004 bytes
SHA-256: 362086a8f56becab1e2b8f44868f1ace5d1236085d6934dd516d9ad08fd09d1b

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