Malicious PDF — malware analysis report

Static analysis result for SHA-256 242db21ce38ebf38…

MALICIOUS

PDF

70.0 KB Created: 2021-03-24 19:06:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bf0b0325922f75d5984e1ca01ade42f0 SHA-1: 93b58637ee476633491e2f5891138695e496a442 SHA-256: 242db21ce38ebf3812b4e07917fcf6af6f2215c28c2aa5bb9b037636604851f4
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including PDF_SEO_LINK_FARM and ML_NYX_PDF_MALICIOUS, indicating a high likelihood of malicious intent. The presence of numerous external links, particularly those hosted on domains like druttle.ru and cdn.sqhk.co, suggests an attempt to redirect users to potentially harmful websites. While no scripts were explicitly extracted, the PDF structure and link farm behavior are consistent with phishing or malware distribution campaigns.

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://druttle.ru/award?keyword=alter+ego+plus+4+cahier+d+activit%25C3%25A9s+pdf
    • https://cdn.sqhk.co/mibaforetu/jh150ji/94215604736.pdf
    • https://cdn.sqhk.co/durotula/NiajcED/89776126840.pdf
    • https://cdn.sqhk.co/gonolesuzam/heGjaji/dragon_ball_z_dokkan_battle_mod_apk_jp.pdf
    • https://cdn.sqhk.co/kupodakojav/jhl1Aha/free_cv_template_uk_gov.pdf
    • http://fenofojerafama.22web.org/dokekikamakusalomukigo.pdf
    • https://cdn.sqhk.co/kivipemo/CBzRJjj/4831920716.pdf
    • http://nowofuguvinidaw.iblogger.org/wowidu.pdf
    • https://cdn.sqhk.co/dudavizi/Eibgehi/pokemon_center_locations_canada.pdf
    • https://cdn.sqhk.co/vilubofi/mjat1gi/heart_rate_monitor_compatible_with_peloton_app.pdf
    • https://cdn.sqhk.co/guwaloxipete/BgDjghg/16924051678.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/gezizefefififa/linejakakijumumokap.pdf
    • https://52c77544-2eb8-427c-ad0e-a8a7e2ea9366.filesusr.com/ugd/93288f_4bedc59afdbe418b893bb3764c29ef0d.pdf?index=true
    • https://s3.amazonaws.com/dapekufoxiraku/letra_y_acordes_de_yo_sin_tu_amor_alicia_villarreal.pdf
    • https://d4cba69e-f3c5-4a64-9e40-69ba24924691.filesusr.com/ugd/b73feb_94ea0953453246468009e77ebb5d228c.pdf?index=true
    • https://00eaa6b3-f026-4720-b00f-fafb40066352.filesusr.com/ugd/d498be_8af3176da4314f19b8d528eee2ca0827.pdf?index=true
    • https://s3.amazonaws.com/tarizirefevifab/guidelines_definition_nhs.pdf
    • https://s3.amazonaws.com/lumixi/9948619371.pdf
    • https://377d1c6c-8747-407e-9a0d-bb8234813250.filesusr.com/ugd/f0b1fd_160a2fe6bdbc4f38abe26cf78b2312f2.pdf?index=true
    • https://9f503c4c-bf14-4dcb-9a7a-68e0e5bb3568.filesusr.com/ugd/8ac1ab_bfc1f7cc4cb44873add509f73926783b.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_off0000d172.bin
5c21ddb4596af728f716ca83948abea0a1a5574b0c3e6f27da298bcbac6414e2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD172 5696 bytes
font_01_sfnt_off0000e4ab.bin
b8a848575498c3f3166c179c158d0f36ade3c535d4ffc64343bde07e2aa6d021		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE4AB 10688 bytes

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