Malicious PDF — malware analysis report

Static analysis result for SHA-256 9eddb81c3fb87132…

MALICIOUS

PDF

75.2 KB Created: 2021-03-25 17:06:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 311f0834d2d78641c32594cfa5353f78 SHA-1: 7ac8dede4c047c77bf6fa8d6fdc5b59a086376c5 SHA-256: 9eddb81c3fb871327ba1cf6d0748789c1e8f2f907dcb81bea6d31f211a4c4fb9
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic. One of the primary external URIs points to 'https://vilenefex.ru/123?utm_term=boxing+practice+video', which is likely part of a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://vilenefex.ru/123?utm_term=boxing+practice+video
    • https://cdn.sqhk.co/tezofugowura/fnZJdwt/fabewinejonexorujup.pdf
    • http://bawimip.sportsontheweb.net/zisanoziruvezafogi.pdf
    • http://winovigamaj.mygamesonline.org/jidejovov.pdf
    • https://cdn.sqhk.co/jedepazisu/i2ppcSm/reconstitution_math_problems_with_answers.pdf
    • https://cdn.sqhk.co/kesavaki/gfkwf5b/waze_app_download_free.pdf
    • https://cdn.sqhk.co/gupuwiwi/4XG90LT/black_girl_halloween_costumes_2019.pdf
    • http://jafoxidulez.mypressonline.com/can_i_make_my_tv_remote_control_my_soundbar.pdf
    • http://worabipupe.mypressonline.com/caryl_churchill_plays.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://86146b48-cf95-488a-b5a0-22832f4589a6.filesusr.com/ugd/3b4eee_38760de311c540d9b11793101435b88a.pdf?index=true
    • https://247e77cc-5367-4382-8586-7c5891409f42.filesusr.com/ugd/2dbf5a_ff3f3066f4234cffb38ad02b67973da6.pdf?index=true
    • https://43a2ba88-5de9-465b-b95f-6a4d82f2d06e.filesusr.com/ugd/dcbeda_3ebcc736d6264cd692775e65d1419a8d.pdf?index=true
    • https://s3.amazonaws.com/jolozidabi/28030150841.pdf
    • https://0491f86b-060d-4f4a-be23-b0d01488777f.filesusr.com/ugd/faa7ef_cc8bba5d656f4089b497eac1c85f176f.pdf?index=true
    • https://a8a70d16-e3f0-4805-b115-4d8c62c40b57.filesusr.com/ugd/82e28d_a23ec7d210b9477096f213e1f38170b5.pdf?index=true
    • https://dce09894-55e7-49e1-9c43-b94069c58f23.filesusr.com/ugd/11ae40_f14c8e6f571041c6a938c5869d7a5859.pdf?index=true
    • https://5849b288-062f-49f8-a71b-da420f1f00fd.filesusr.com/ugd/c068f8_58f4d1ad00bf496fab5ab956348f5bb4.pdf?index=true
    • https://s3.amazonaws.com/gisujubolidine/suputipiwozuxuzegazepojo.pdf
    • https://45e41439-46a4-4c97-84f0-155cfeda4cef.filesusr.com/ugd/9d7ad9_94bb6c4fb3b64aca9845fafa1d1e5c70.pdf?index=true
    • http://mijovutotukedes.onlinewebshop.net/41742412601.pdf
    • https://51bf459c-6b46-41b0-863f-532cf8a77e0d.filesusr.com/ugd/2eedf1_fbf4210bd5994853888cb0e006802970.pdf?index=true
    • https://8b5ac0f3-2bc4-49a6-9a99-2541af31b215.filesusr.com/ugd/f2ef67_835fcb1f2313402e84ef353ebf17a4e6.pdf?index=true
    • 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_off0000e878.bin
924a6ad3452862b8dfcd6f6e06ed50b72f336acce2a11d1211e8f72083a8b3aa		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE878 5208 bytes
font_01_sfnt_off0000fa4d.bin
e1cef0975ef40d91988da53fcfae8e658bfb26edfcfe3647ba3ff5afcfa6afdb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA4D 10924 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.