Malicious PDF — malware analysis report

Static analysis result for SHA-256 35c31335660509ce…

MALICIOUS

PDF

39.8 KB Created: 2020-11-09 16:31:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: efb5643eaef7867ed502b8d1782759f0 SHA-1: 1192d66f4d9233e4e6a143591b8631d129869f94 SHA-256: 35c31335660509cecccd93c9bd91d9dc7a13bda593b0348ffc7dca83156df34c
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or SEO manipulation tactic. One of the primary external links points to a URL that is not yet classified, while others are classified as benign. The ML classifier strongly flagged this PDF as malicious. No scripts were extracted, but the presence of numerous external links indicates a potential for redirecting users to malicious sites or for SEO spam.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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/123?keyword=hacksmith+industries+lightsaber
    • https://todurudivi.weebly.com/uploads/1/3/4/3/134344361/67ba6972c8b16.pdf
    • https://xuvarilanagore.weebly.com/uploads/1/3/4/4/134470983/1cad9.pdf
    • https://lanulizuxuja.weebly.com/uploads/1/3/4/6/134658029/dalozuden.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/xedewofuretujo/steele_rubber_products_promotional_code.pdf
    • https://s3.amazonaws.com/kavugusepe/4431933148.pdf
    • https://s3.amazonaws.com/lolijexejomak/iomega_external_hard_drive_drivers_windows_8.pdf
    • https://s3.amazonaws.com/zabevog/phr_study_guide.pdf
    • https://s3.amazonaws.com/wonoti/att_uverse_packages.pdf
    • https://s3.amazonaws.com/mupakijivuruzim/6868325288.pdf
    • https://s3.amazonaws.com/zetare/anlodipino_5_mg_bula.pdf
    • https://uploads.strikinglycdn.com/files/e446e6e7-8f6e-4a3d-a7ed-8843f1ffae32/bejigepila.pdf
    • https://s3.amazonaws.com/voxulija/an_old_man_guy_de_maupassant.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005de0.bin
7a36572d4f3b1d5901824ad82b0aec971fb5f7989c77c79b347f52234e684051		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5DE0 5516 bytes
font_01_sfnt_off00007072.bin
20829188caf73172f6d3da296fde8d2615f8eb949c1fa2bb00bb1fbad0686504		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7072 10048 bytes

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