Malicious PDF — malware analysis report

Static analysis result for SHA-256 29ef715a4134fbb7…

MALICIOUS

PDF

95.6 KB Created: 2020-11-24 14:05:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6f5465943d1c57b3d6a9a063b8939897 SHA-1: 1f5243931cf2a47fe28a589ea446ba3591258549 SHA-256: 29ef715a4134fbb7dda8a612b700ba6d189d775c954e5b6b6f78f8fb7a75742b
156 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a large number of external links, with one prominent link pointing to a suspicious domain that appears to be part of a link farm. The ML classifier and ClamAV also flagged this PDF as malicious, specifically as a phishing trojan. The embedded URL suggests a lure related to exam dates, likely to trick users into visiting a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/aws?utm_term=board+exam+date+sheet+cbse
    • https://cdn-cms.f-static.net/uploads/4422368/normal_5fb355ac4b85a.pdf
    • https://nosokubidudat.weebly.com/uploads/1/3/4/3/134321305/6379433.pdf
    • https://cdn-cms.f-static.net/uploads/4426690/normal_5fa0dc25673d1.pdf
    • https://cdn-cms.f-static.net/uploads/4481671/normal_5fad68666a091.pdf
    • https://xoniwolujejusun.weebly.com/uploads/1/3/4/4/134456196/9320014.pdf
    • https://cdn-cms.f-static.net/uploads/4366335/normal_5f8b316a87f31.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fedorahosted.org/lohit
    • https://uploads.strikinglycdn.com/files/616307c7-0ea3-4677-b68e-c3cc78488e3b/rulijiwoz.pdf
    • https://uploads.strikinglycdn.com/files/65ea948f-9b3e-455c-8837-62e9810d94b1/xekasowurulenatugasobevi.pdf
    • https://uploads.strikinglycdn.com/files/7336ab1d-59fa-435e-8b5c-b70961bedc6e/93798850020.pdf
    • https://uploads.strikinglycdn.com/files/aeebaa45-0747-4973-bc52-66beb80b969c/que__bilbo.pdf
    • https://uploads.strikinglycdn.com/files/2e4d797c-2a32-4b78-b8cd-a5af8365ea4d/bnl_call_and_answer_chords.pdf
    • https://uploads.strikinglycdn.com/files/81356460-f718-4026-b144-c55d009d8a50/ppg_car_color_chart.pdf
    • https://uploads.strikinglycdn.com/files/7435f7bf-d937-4fa1-8ebd-567b16dfdb99/vosebujebixiwekefesupuwu.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
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNU
    • http://www.gnu.org/copyleft/gpl.htmRegular
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f7c8.bin
424b0b47d13afe1c0b6ca877206d6747dc33f4c8e7aca8b6475468e24afa404a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF7C8 5404 bytes
font_01_sfnt_off000109fd.bin
6539b129c5cd894636dc8f40f53a156c00c8f46378ab4f137c96d687a1cff6ed		 pdf-font-stream PDF embedded font (sfnt) at offset 0x109FD 3720 bytes
font_02_sfnt_off00011560.bin
a8e0d2fc3a0f3d9a16535107eb3c2b674efd829c6e5203a55ff7168df7b7f07d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11560 10956 bytes
font_03_sfnt_off00013a43.bin
61761e6c71fdd980502ce8a3a8cbf9590216241eb9eabe72fdf309a1c23cd3c2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13A43 16096 bytes
font_04_sfnt_off00014f49.bin
4d0fa70ecb2117f20ac08cf2c7ef00c743a21a1ca4a9a28199c2ac1fa4fac951		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14F49 10592 bytes

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