Malicious PDF — malware analysis report

Static analysis result for SHA-256 da109b357ffaac16…

MALICIOUS

PDF

81.3 KB Created: 2021-03-22 22:21:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: a2d6e4824d6dfefacf322dffe5938525 SHA-1: 10ec22889fd9cf496a2a7f99062746081b43d5e9 SHA-256: da109b357ffaac16e5e17783bb7e76cc172a4286a12d9a309cb458464e75fd43
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to other PDF files, suggesting a link farm or SEO poisoning tactic. The primary URL, 'https://leonvi.ru/award?keyword=pothichoru+short+story+pdf+download', is presented as a search result, aiming to trick users into downloading more content. While no scripts were explicitly extracted, the PDF structure and the heuristic firings strongly indicate malicious intent, likely related to phishing or malware distribution via document downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://leonvi.ru/award?keyword=pothichoru+short+story+pdf+download PDF link annotation
    • https://vabiganivasekeb.weebly.com/uploads/1/3/4/3/134339064/sogiko-fiximonedewitiv-gilolofirew-tolis.pdfIn PDF document text
    • https://cdn.sqhk.co/zomulusiku/jzjcPUq/54989671087.pdfIn PDF document text
    • https://cdn.sqhk.co/xizemeginu/dwicicu/among_us_character_red_with_horns.pdfIn PDF document text
    • https://wuwikofoxanep.weebly.com/uploads/1/3/1/4/131437976/6360e1.pdfIn PDF document text
    • https://xurebutira.weebly.com/uploads/1/3/2/6/132681359/968e2307b3853.pdfIn PDF document text
    • http://vomuniwawan.iblogger.org/gewogusarakorepazixo.pdfIn PDF document text
    • https://sinosopad.weebly.com/uploads/1/3/4/8/134892142/6d4e5fda893d006.pdfIn PDF document text
    • https://cdn.sqhk.co/kutupejotige/avpIjaD/four_kings_casino_ps4_trophy_guide.pdfIn PDF document text
    • https://lisogawe.weebly.com/uploads/1/3/5/3/135312855/vibigufivumat.pdfIn PDF document text
    • https://vifejekim.weebly.com/uploads/1/3/5/3/135322606/1574667.pdfIn PDF document text
    • http://vafutixon.22web.org/xodofolivapenuvesag.pdfIn PDF document text
    • http://vavesojijakoju.iblogger.org/42557585665.pdfIn PDF document text
    • https://cdn.sqhk.co/sesudegaruta/xsgiHjb/sumoxijepofoxotamamirid.pdfIn PDF document text
    • https://gitujibexilen.weebly.com/uploads/1/3/1/4/131406430/cd839fa.pdfIn PDF document text
    • https://mukeremu.weebly.com/uploads/1/3/4/3/134316251/pelofajuw-tokobimedesa-sexexuwozoxilaz-gakajiga.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/xuzakob/beep_beep_notification_sound.pdfIn PDF document text
    • https://s3.amazonaws.com/sabobenuwe/kubasejisekofuvasemeza.pdfIn PDF document text
    • http://nisinukodepafix.rf.gd/fiberiruleginatojisa.pdfIn PDF document text
    • http://nitusul.rf.gd/sokupujivegapawujiba.pdfIn PDF document text
    • https://s3.amazonaws.com/lofese/challenge_movie_video_song.pdfIn PDF document text
    • https://s3.amazonaws.com/mexavofezoxi/el_llano_en_llamas_de_juan_rulfo_cuento_corto.pdfIn PDF document text
    • https://s3.amazonaws.com/sixenogafopoj/malaysian_anti-_corruption_commission_act_2009.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_off000100d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100D9 5436 bytes
SHA-256: 73fbfff660a316e5cba0697db62f413e6fe2f1e7a61a0789adf595147d07c71a
font_01_sfnt_off00011367.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11367 10704 bytes
SHA-256: 335f4de6220320fef0834a67a3d52c698c9820988fb51d3b2ad71bba2b8f7c8b

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