Malicious PDF — malware analysis report

Static analysis result for SHA-256 b012efc5d40cea9d…

MALICIOUS

PDF

81.2 KB Created: 2021-04-03 17:51:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: a76f8676800eb2357014a76dc8dee482 SHA-1: b007b5b6226936937c935b5d56d21c163634856d SHA-256: b012efc5d40cea9d5d063d9579a16e2b4f7e807ba077f7aa2e084e9f7b3092e4
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://vilenefex.ru/award?keyword=streszczenie+akademii+pana+kleksa+pdf PDF link annotation
    • http://kirakexig.mypressonline.com/34173453085.pdfIn PDF document text
    • http://changepass.online/ukulele_strumming_patterns_4_4d4fg6.pdfIn PDF document text
    • http://form-lnstagramcopyrightservices.com/jovorenomokuxobukubanuxesfnbu.pdfIn PDF document text
    • http://newuwedeza.mypressonline.com/catching_fire_full_movie_free_download.pdfIn PDF document text
    • http://nejevefivi.mypressonline.com/zoraturibedividixugo.pdfIn PDF document text
    • http://tazotirivixo.22web.org/tao_tao_49cc_scooter_review.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://faganelatoke.epizy.com/69665316442.pdfIn PDF document text
    • https://s3.amazonaws.com/suzujewa/94807201499.pdfIn PDF document text
    • http://samajusinifako.atwebpages.com/39738013008.pdfIn PDF document text
    • http://dovanokeji.epizy.com/formato_certificado_medico_escolar_secretaria_salud_2020.pdfIn PDF document text
    • https://s3.amazonaws.com/woxewiwupir/aws_appsync_android_sdk.pdfIn PDF document text
    • http://fazovalekotevo.onlinewebshop.net/sound_of_silence_text.pdfIn PDF document text
    • https://s3.amazonaws.com/miledu/3d_video_song_full_hd.pdfIn PDF document text
    • http://jilerixam.epizy.com/metebovavifupekevuvasupaw.pdfIn PDF document text
    • https://b89c0965-50b5-483f-b67e-52f573158f4f.filesusr.com/ugd/1e222e_30b28808f0f9487eb615011a73032167.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/mawesenasijoser/marvel_avengers_academy_apk_free.pdfIn PDF document text
    • https://81da36f4-dec6-4bf4-836b-19ed67500659.filesusr.com/ugd/5fd5c1_565d926e4d714449a3f71bb3158b48ab.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tufitijinexu/53436210640.pdfIn PDF document text
    • https://s3.amazonaws.com/jakujakula/47082197423.pdfIn PDF document text
    • https://91506351-5699-48ce-85e7-8e7d071f4e87.filesusr.com/ugd/d775a9_6edaa626a3be4c84b5cbec13eec4da93.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fd7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD7A 5516 bytes
SHA-256: 843369b3a8f625331293eee818d8bd7b35b7ce74da41566c26bc0ebb82409009
font_01_sfnt_off00011035.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11035 11780 bytes
SHA-256: 9036f8e9705d898a75c08a635250cca2cb57bd976d20e951c7eececeb15b5058

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