Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b4b37c30410d111…

MALICIOUS

PDF

65.9 KB Created: 2021-06-09 22:25:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b4cc50b83b3a2fb30c787e647f1de0b4 SHA-1: dc033ff6c4ca483f1580a3bcca19055f6957a239 SHA-256: 7b4b37c30410d1118f496b83e2a246aa510e53371bdb77ebe7f1bb1f9b80fb27
156 Risk Score

Malware Insights

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

The sample was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution intent. It contains a large number of external links, with one suspicious URL pointing to 'coretry.ru'. The PDF structure and link farm heuristic suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://coretry.ru/pbw?utm_term=m+dil+image
    • https://joxaguxurotaz.weebly.com/uploads/1/3/7/5/137507581/vejibedavix_mufenobuka_xupudex.pdf
    • https://bupafenanibud.weebly.com/uploads/1/3/4/0/134042845/87a6b5.pdf
    • https://static.s123-cdn-static.com/uploads/4460447/normal_60058784ac731.pdf
    • https://relewamomoj.weebly.com/uploads/1/3/4/3/134349818/winoferakoxe_wikim_mifodubazusobar.pdf
    • https://pumutetigowon.weebly.com/uploads/1/3/4/6/134699291/wudowaguz.pdf
    • https://juxufosuzuvol.weebly.com/uploads/1/3/1/4/131437906/203480.pdf
    • https://static.s123-cdn-static.com/uploads/4502721/normal_5fc871b69ff09.pdf
    • https://funudenor.weebly.com/uploads/1/3/4/3/134319253/bf116f4f018.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/874ec8cd-9c61-4901-bd86-cb473ef30f62/samsung_aquajet_vrt_smart_care_top_load_washer_manual.pdf
    • http://vowijeve.pbworks.com/w/file/fetch/144837216/rwby_ost_download_mega.pdf
    • https://uploads.strikinglycdn.com/files/34d0be50-ae36-4e7d-9672-b3d5e59b03f7/58259624314.pdf
    • http://fufitan.pbworks.com/f/wwe_2k17_apk_file_download_for_android.pdf
    • http://legesir.pbworks.com/f/mindtap_psychology_statistics_answers.pdf
    • http://zolunegoli.pbworks.com/w/file/fetch/144561834/zibar.pdf
    • https://uploads.strikinglycdn.com/files/47ec393e-5db3-4211-97d5-b274d5f5dd0e/25807831530.pdf
    • https://uploads.strikinglycdn.com/files/85641138-def3-4c83-a6ad-b7504f924a36/how_is_a_stress_echocardiogram_done.pdf
    • http://wasazejis.pbworks.com/w/file/fetch/144942666/comali_movie_download_in_isaimini.pdf
    • http://natofuke.pbworks.com/f/free_event_sign_in_sheet_template_baby_shower_guest.pdf
    • http://lugozamuxika.pbworks.com/w/file/fetch/144418116/ripanejava.pdf
    • https://uploads.strikinglycdn.com/files/a1844a10-684e-4c76-ade8-03cee398cf7c/birosananobobinoj.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_off0000ca2f.bin
e5e0e7c660bd5e179cc032ef95e67455c2467c64a5b19b738dd61bdbcc30d434		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCA2F 4876 bytes
font_01_sfnt_off0000dabb.bin
db17b9da9ed63bcba7582e4dc8018b97543c8f8a4893d90c23ff312127c727dc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDABB 9460 bytes

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