Malicious PDF — malware analysis report

Static analysis result for SHA-256 6347d15e28b7afe3…

MALICIOUS

PDF

88.2 KB Created: 2021-03-22 22:17:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 25e6ce70353179d64a893898481e86e7 SHA-1: 2419a98b3383f9368e491429e93480494e4f4737 SHA-256: 6347d15e28b7afe376b9bfbdbbbfb04837c73b4c083fa665ec0e7cd7782627d6
156 Risk Score

Malware Insights

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

The PDF document is identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains a large number of external links, suggesting a link farm or a method to distribute further malicious content. While no scripts were explicitly extracted, the PDF structure and the presence of numerous external URIs indicate a malicious intent, likely related to phishing or SEO manipulation to distribute malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • 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://jumiwimov.ru/award?keyword=free+popular+piano+sheet+music+pdf+downloads PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4453540/normal_5fc8a5673b4ac.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456134/normal_5fe6e8e17849c.pdfIn PDF document text
    • https://cdn.sqhk.co/luwivimexu/fyMgihd/egoist_alter_ego_album.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368250/normal_603d6f990daed.pdfIn PDF document text
    • https://jebezefekoju.weebly.com/uploads/1/3/4/7/134737834/juralogopeluxokovuka.pdfIn PDF document text
    • https://cdn.sqhk.co/gijimexuv/sigjggh/color_passion_mask.pdfIn PDF document text
    • https://cdn.sqhk.co/gojogefe/lidOAB0/beyblade_burst_shu_coloring_pages.pdfIn PDF document text
    • https://cdn.sqhk.co/pixazizaze/gdhbtMs/27654038761.pdfIn PDF document text
    • https://cdn.sqhk.co/limiwebu/jjgfUN9/zujojirizaseru.pdfIn PDF document text
    • https://cdn.sqhk.co/nozelenid/PIgjKh8/school_of_dragons_gems_hack.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450158/normal_6047458d8b743.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470232/normal_602019cfd33a2.pdfIn PDF document text
    • https://cdn.sqhk.co/vusutazomaga/jhwhdy9/safiwijuwikes.pdfIn PDF document text
    • https://cdn.sqhk.co/kabevapixox/idiifhc/best_hockey_battle_drills.pdfIn PDF document text
    • https://cdn.sqhk.co/liregevo/MOjfjcp/90846178086.pdfIn PDF document text
    • https://dorikorojuj.weebly.com/uploads/1/3/3/9/133987202/gaxevunoge.pdfIn PDF document text
    • https://cdn.sqhk.co/nebafaveju/cXZicev/79714103163.pdfIn PDF document text
    • https://cdn.sqhk.co/senogewuki/hfvijcC/snake_vs_block_game_play_online.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://b46c4cda-4951-41c0-816f-bbf02eee4d9b.filesusr.com/ugd/4ff992_38cf68ef885b4d17a426a2db1badafe9.pdf?index=trueIn PDF document text
    • https://7f03322d-63d6-449b-a8c2-a80beffeb2b6.filesusr.com/ugd/2994dd_f474d383cac94aa78986b95c43a76ed7.pdf?index=trueIn 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_off0001056c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1056C 5440 bytes
SHA-256: ec542624a04a3874739ba437145861ea56ceaf4ad06c636e817a419e6569f763
font_01_sfnt_off000117d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117D2 11312 bytes
SHA-256: 5bc3dd4e03439db079ce12cda6545b5f691dce8fa48864724fedf77a38f58a14
font_02_sfnt_off00013e36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E36 16100 bytes
SHA-256: b59afbb2f683942213df284fd86cd9422ada0c5f1ffac7698db8c94a40390bc4

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