Malicious PDF — malware analysis report

Static analysis result for SHA-256 7155c28d7a0485e2…

MALICIOUS

PDF

77.8 KB Created: 2021-06-05 10:40:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: eb741ba1e398f5d7d592b93c1eeb408a SHA-1: e0939f9d845f75873fb8246b9ffd7396c6972137 SHA-256: 7155c28d7a0485e2ca0775ed81e1b24cce9b6032266ad160ae6df80bf984d04c
186 Risk Score

Malware Insights

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

The PDF file contains a significant number of external links, many pointing to disposable hosting services, suggesting a link farm or phishing operation. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or SEO manipulation. No scripts were extracted, but the embedded URLs are the primary indicators of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://queure.ru/pbw?utm_term=miraculous+release+date PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4491451/normal_605557a9023ad.pdfIn PDF document text
    • https://zujamapetot.weebly.com/uploads/1/3/1/3/131381682/wiguzukem_tizisiluvu_pibufaf_bililivoravijoj.pdfIn PDF document text
    • https://wazurewimi.weebly.com/uploads/1/3/4/5/134598950/bujumobisaf-bidigo.pdfIn PDF document text
    • https://roluwisotem.weebly.com/uploads/1/3/4/3/134368144/difarumesagimujukad.pdfIn PDF document text
    • https://wowuleraregode.weebly.com/uploads/1/3/4/6/134690179/juvatuwukolaxo.pdfIn PDF document text
    • https://sigojexubaj.weebly.com/uploads/1/3/2/6/132682800/vizugirik.pdfIn PDF document text
    • https://noxutepobop.weebly.com/uploads/1/3/4/5/134510102/0c5b45b55b6ea7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448323/normal_5ff926c43fc6a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378843/normal_5ff13ff547559.pdfIn PDF document text
    • https://popoxalisasuper.weebly.com/uploads/1/3/0/7/130775362/vozolivan.pdfIn PDF document text
    • https://vigiminalaxu.weebly.com/uploads/1/3/1/4/131454394/812c461a.pdfIn PDF document text
    • https://weluperexofabed.weebly.com/uploads/1/3/5/3/135382791/6397014.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391954/normal_600a3fc6d6d78.pdfIn PDF document text
    • https://vowizata.weebly.com/uploads/1/3/1/8/131856430/zaseposegolugaf.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/f1831689-1842-4037-ab93-b2d56fcba683/13358627093.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/87212d84-eee1-4c8c-a8e4-3cf84a72852e/lenovo_g50-80_laptop_display_price.pdfIn PDF document text
    • http://mituxap.pbworks.com/w/file/fetch/144425349/3ds_max_vray_material_tutorial_free_download.pdfIn PDF document text
    • http://zepadatoju.pbworks.com/w/file/fetch/144416484/13173010163.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e1ed6a00-6794-4e08-bc71-4930ed1ecfbd/teorias_de_la_personalidad_susan_cloninger_descargar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/757a7b5f-436a-41ed-8bf7-4a9b390b5aeb/what_is_the_mileage_of_fz_v3.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4ecec3b9-b874-493b-b8d4-d27a2f1a46ae/389440718.pdfIn PDF document text
    • http://fuvesiwowegu.pbworks.com/f/exercises_on_direct_and_indirect_speech_for_grade_6.pdfIn PDF document text
    • http://xofitesu.pbworks.com/f/sofuli.pdfIn PDF document text
    • http://jajisaparev.pbworks.com/w/file/fetch/144419166/accounting_ratios_class_12_questions_and_answers.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_off0000f340.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF340 4940 bytes
SHA-256: aabe44a383e3f18783f03b22ee273dd6c9b4128cf5b2c769b46d1b8d00f26558
font_01_sfnt_off0001041e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1041E 11000 bytes
SHA-256: cd383b1a3b693b4e4252fdc1d07c225296892003f9ec96332456a7ba32eda8de