Malicious PDF — malware analysis report

Static analysis result for SHA-256 7305b3d1373ea1f5…

MALICIOUS

PDF

84.6 KB Created: 2021-04-04 17:50:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 0621efa05f474a527a74dcf6276e3d79 SHA-1: 786164d7cd4f803e96f8beb710f95e4600ca2663 SHA-256: 7305b3d1373ea1f55827786a680618661e11ae6859a14f46e042cd79fc5a6a89
156 Risk Score

Malware Insights

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

The sample is a PDF file that contains numerous external links, including one to 'bologen.ru', suggesting a phishing or link-farming attack. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as a phishing trojan. The presence of embedded links and the overall structure point towards an attempt to redirect users to malicious sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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/strik?utm_term=holmes+humidifier+instruction+manual PDF link annotation
    • https://cdn.sqhk.co/nigezufi/iXib2WI/71682809369.pdfIn PDF document text
    • http://fopijuzege.22web.org/fexabujo.pdfIn PDF document text
    • https://cdn.sqhk.co/kinibemazoz/Vsiizkh/candy_crush_friends_saga_jugar_online.pdfIn PDF document text
    • https://cdn.sqhk.co/vovomafejuwa/hhjO0Ng/7283194809.pdfIn PDF document text
    • https://cdn.sqhk.co/lowixadoges/Eiehfje/oscar_de_la_renta_wedding_dresses_cost.pdfIn PDF document text
    • https://cdn.sqhk.co/dapubebireba/ji2jehd/pitch_tuning_guitar.pdfIn PDF document text
    • https://cdn.sqhk.co/zepinima/X9YQvii/mozuladofotoxuno.pdfIn PDF document text
    • https://cdn.sqhk.co/vomawoko/1ucigfF/washable_cotton_face_masks_amazon_uk.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://0ed7c29b-d5f2-4290-8b47-add6aa38300d.filesusr.com/ugd/32a223_ff16fc8f86bc4a07b89f631ccb3f27b5.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vavabi/nabidovigabupizu.pdfIn PDF document text
    • https://88211235-bf86-4d40-a6ec-a052db2f682e.filesusr.com/ugd/94e5ef_132da234f5bd41cfa88cf24956f94912.pdf?index=trueIn PDF document text
    • https://3d7304b5-8527-495f-b913-615d6f357a43.filesusr.com/ugd/ef7486_f607636a510f4b179507cf1e9383aa01.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xofalepelala/sony_a77_ii_used.pdfIn PDF document text
    • http://dakawarinuku.epizy.com/manejo_de_varicela_en_adultos.pdfIn PDF document text
    • https://s3.amazonaws.com/wozoxub/2069112380.pdfIn PDF document text
    • https://s3.amazonaws.com/bejokazemur/xexik.pdfIn PDF document text
    • https://s3.amazonaws.com/wezukep/el_basilisco_chilote_worksheet.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f512.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF512 5220 bytes
SHA-256: a5856cd89bc4f2ee299e47caacd82e5ee28355c38c45cf5922e976ac95a8a29a
font_01_sfnt_off000106a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106A1 12080 bytes
SHA-256: 70702e954dd095e0a015452a4333adff358866e6fae3de2b8738bc6ed2388333
font_02_sfnt_off00012da5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DA5 16876 bytes
SHA-256: a987449a195854f2da8fc9be4bfa523ba37347d04953fab90dd70ddb79372158

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