Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbe56ecd2782c96c…

MALICIOUS

PDF

77.8 KB Created: 2021-03-12 17:50:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 074f4ac377fc94992797661e0fe49f82 SHA-1: 77f0fe2fc63d7b9f43e0f4d0c965f1a32b832f09 SHA-256: cbe56ecd2782c96ca20076d328498372f97dc3330f2f0fed2a3adda99e41a19a
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, specifically identified as a phishing trojan by ClamAV. It functions as a link farm, containing numerous external URLs that point to other PDF documents, likely for SEO manipulation or to distribute further malicious content. The primary malicious URL identified is https://gimoguvi.ru/123?utm_term=hungry+shark+2019+apk+hack.

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://gimoguvi.ru/123?utm_term=hungry+shark+2019+apk+hack PDF link annotation
    • https://penopamez.weebly.com/uploads/1/3/4/4/134496097/nesadig.pdfIn PDF document text
    • https://vakikuxikedeti.weebly.com/uploads/1/3/5/3/135320305/ce9916.pdfIn PDF document text
    • http://findfreegirl.com/timex_ironman_classic_50_reviewyw2bd.pdfIn PDF document text
    • https://gepidoduxaw.weebly.com/uploads/1/3/5/3/135324144/1120044.pdfIn PDF document text
    • http://idealslimitalia-official.site/b._com_final_year_auditing_notesb36p5.pdfIn PDF document text
    • https://fumevixupi.weebly.com/uploads/1/3/0/7/130775707/kazosisukuvurobug.pdfIn PDF document text
    • https://vimugowome.weebly.com/uploads/1/3/4/3/134323071/1afeb.pdfIn PDF document text
    • https://rudazijix.weebly.com/uploads/1/3/1/4/131453676/576eea3960.pdfIn PDF document text
    • http://hayatevesigar.online/how_to_get_netflix_on_lg_tv6guoz.pdfIn PDF document text
    • https://jexajopox.weebly.com/uploads/1/3/4/6/134656613/3797421.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/5dce1528-2be9-472a-876d-40142929ef41/kiduse.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bdeb62f5-575e-4a84-bca7-b7467c0d30d4/which_twilight_movie_comes_after_new_moon.pdfIn PDF document text
    • http://lirepotinemos.rf.gd/buenos_dias_princesa_en_frances_traduccion.pdfIn PDF document text
    • http://xakodalomidu.rf.gd/golden_eagle_predator_compound_bow_specs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6737e1f5-2046-4f0a-bd54-be17dea0d71f/comparative_research_designs_and_methods.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4576c95a-4f80-4e87-b707-c9111d91b0a9/how_to_get_maintenance_journeyman_card.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/df2bb0f6-7bb6-41ce-81e4-08fb8e54967d/rosipubiriv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/853debe1-b021-4137-a496-8c4f32c6d71f/interview_questions_and_answers_in_hindi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ede2652f-abb1-410a-8f18-f539ce0f944b/what_order_to_watch_the_girl_with_the_dragon_tattoo_movie_series.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7419f8a5-44af-4685-bc3b-4631b6bf6a8e/tony_little_gazelle_freestyle_evolution.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_off0000f236.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF236 5772 bytes
SHA-256: 4395f7672bb97f5c1be463bc3b85c0ea29b5a5c84bbfa986dd586106becd0215
font_01_sfnt_off000105e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105E5 10664 bytes
SHA-256: 23444a7871b52af35f726728c2103f141401e52c86fcadabd4de6967c9c5be0b