Malicious PDF — malware analysis report

Static analysis result for SHA-256 cac5538cec3ba931…

MALICIOUS

PDF

85.6 KB Created: 2021-05-13 18:01:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: d3c606718ba16b0b5533d43efe3277be SHA-1: 9ca07fb5a708026470183d303d9140d16ef62bd1 SHA-256: cac5538cec3ba931faa0c9324d26e73813acd75807ff0788bbb88dd911c2f67a
186 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. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • 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 https://golowaki.ru/strik?utm_term=trigonometric+functions+word+problems+pdf PDF link annotation
    • http://tejovotemikodes.getenjoyment.net/tiwowedomufagemotitove.pdfIn PDF document text
    • https://cdn.sqhk.co/maputaliki/4FgdACK/fruit_ninja_mod_apk_2._8._8.pdfIn PDF document text
    • https://cdn.sqhk.co/lutidofele/ijic4P2/college_sports_apparel_near_me.pdfIn PDF document text
    • https://cdn.sqhk.co/rarukaboz/giQgdgh/5d_galaxy_live_wallpaper_iphone_x.pdfIn PDF document text
    • http://mapugukabazewu.scienceontheweb.net/czasy_przysze_angielski_wiczenia_z_odpowiedziami.pdfIn PDF document text
    • https://cdn.sqhk.co/mofipife/fF7vjeO/nirorupokametiniwepovo.pdfIn PDF document text
    • https://cdn.sqhk.co/furikute/jgBjAhg/android_studio_sdk_location_ubuntu.pdfIn PDF document text
    • https://cdn.sqhk.co/bidekidarub/SidxAUU/extreme_landings_pro_mod_apk_for_pc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/3cfb50a6-be80-4ea7-8309-8586393fc68e/tafozalumevigisujelenitit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cb195b28-44f8-414d-9e38-676172195b63/pakexosikadogelopudilam.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6f7459d8-ad03-47ff-b7f8-35a3fc944f1d/nesusexoz.pdfIn PDF document text
    • https://d4cba69e-f3c5-4a64-9e40-69ba24924691.filesusr.com/ugd/b73feb_0aea410275b04effbbf6d8f5aa0f7483.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7ef637af-4aa1-4881-9940-f7f760359557/husqvarna_chainsaw_450e_vs_450_rancher.pdfIn PDF document text
    • https://16564176-4c62-44d7-82e3-1dea6b832d73.filesusr.com/ugd/5e57cf_caa115d539d948cbb66c45fb11c6ab32.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b9891b26-e6a0-46bf-99db-12c969821b9c/how_to_do_limits_at_infinity.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/abd22b03-9c3d-4de8-b2db-2788a27d2433/the_stranger_coben_book_summary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/64c9e53c-820f-40fc-8fb6-82747d41eb8c/shadowrun_video_game_xbox_360.pdfIn PDF document text
    • https://9fbeb193-358d-48fe-b9d9-45f8b63f6b3c.filesusr.com/ugd/ab67b9_c7a8799a54014609a7cd3ac3f88faaa4.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4ee4fd91-337a-45da-81c4-9c7a4adbd201/mosofaxalejowadegaw.pdfIn PDF document text
    • http://saluwagasa.onlinewebshop.net/enzyme_biosensors.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dbb39d78-1112-461d-820b-c723181199d2/pojaxuw.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011225.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11225 5444 bytes
SHA-256: b419c640dfc0c038305b256e417bd8ee5d9a860d53003f9518f21cdb8905f932
font_01_sfnt_off000124ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124AC 10588 bytes
SHA-256: 58f5df18301572fc0897c8bea44e66a6a388a21c3dc15785df661b4d028e5623