Malicious PDF — malware analysis report

Static analysis result for SHA-256 a74973286acf7e02…

MALICIOUS

PDF

75.8 KB Created: 2021-03-25 15:38:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e324accffffae9432b11a08542453295 SHA-1: 2eca428fc4965cfd7b3ca99d33132c9ef312442b SHA-256: a74973286acf7e022f342ef100f0f64bc6cf83880b4802c976891431e2291efc
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to potentially malicious or SEO-abused domains, as indicated by the PDF_SEO_LINK_FARM heuristic. The ML classifier and ClamAV also flagged this PDF as malicious, specifically as a phishing or trojan variant. The embedded URLs suggest an attempt to redirect users to malicious content or phishing sites.

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://bologen.ru/wix?keyword=rheem+manuals+water+heaters
    • http://tiriruno.sportsontheweb.net/84305039594.pdf
    • http://pojokup.getenjoyment.net/zitedavijesiwexobedo.pdf
    • https://cdn.sqhk.co/punenekebi/ar2tgic/iphone_text_message_sound_free_download.pdf
    • https://cdn.sqhk.co/wavivatus/JYggmc5/steam_tables_superheated_water_vapor.pdf
    • https://cdn.sqhk.co/fizuborugas/hjqhcP2/balipifolutebavalobat.pdf
    • https://cdn.sqhk.co/jukowejazus/1tfwhiw/snare_drum_pronunciation.pdf
    • https://cdn.sqhk.co/bidamasegom/3kiwgdm/girl_games_cooking_3d.pdf
    • https://cdn.sqhk.co/wukikanas/hdQJo04/moksha_yoga_saint_laurent_montreal.pdf
    • https://cdn.sqhk.co/diwiporeb/ejcyz0M/faterifakegunuwoduja.pdf
    • https://cdn.sqhk.co/keridola/vs0jgIc/special_agent_salary.pdf
    • http://vuvulusigi.scienceontheweb.net/74263283206.pdf
    • https://rovisudaguxu.weebly.com/uploads/1/3/1/4/131438800/natupojalewakizejebe.pdf
    • https://xavimunemu.weebly.com/uploads/1/3/2/8/132815343/0506df1.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/babuxufarizuxur/how_to_create_a_process_flow_chart_in_excel_2013.pdf
    • https://s3.amazonaws.com/jotizifime/79485588737.pdf
    • https://s3.amazonaws.com/devuxuzejozam/how_to_count_1_to_100_in_german.pdf
    • https://b6c9d0de-81a1-4db9-ab7d-8a95af9e63d6.filesusr.com/ugd/b28ae2_613dac9f8b394e57857f2f2b2c11f261.pdf?index=true
    • https://dd907c4b-492b-4b4d-bf3c-9f0b7a2bd2c7.filesusr.com/ugd/96a426_8db83106c8a9472da0df9982a6969bed.pdf?index=true
    • https://s3.amazonaws.com/leteraxewe/ariens_8hp_snowblower_carburetor_adjustment.pdf
    • https://s3.amazonaws.com/gogoxowiniza/bengali_news_app_free.pdf
    • https://86b7bb9a-6a0b-496c-a062-e8aa60c365d0.filesusr.com/ugd/dcf311_9dbf62dde47a41d2a2cfa24904407e7a.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e009.bin
8f76b88e9056ec2d8f83da60569e5c995184849f2a18fff0cc56e1e22c5071ca		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE009 4748 bytes
font_01_sfnt_off0000f008.bin
0fed403726a2d0c00bd2f89e6b16c248eaa9c23dca0603a2fb586833a860de57		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF008 10424 bytes
font_02_sfnt_off000113c8.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0x113C8 4324 bytes

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