Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4557599efd79284…

MALICIOUS

PDF

97.1 KB Created: 2021-04-20 11:29:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 414c5b917d55f788a991bea107e1f748 SHA-1: 94f83740801169156f9bd4ea72327a23dc7fe442 SHA-256: b4557599efd79284abfa19dcc2bc34f3d87349f270177184f8d4bbae7994ba20
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 0.9997

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://seumenha.ru/strik?utm_term=manual+de+sobrevivencia+escolar+do+ned+online+dublado PDF link annotation
    • http://kefijor.mygamesonline.org/lords_of_chaos_movie_soundtrack.pdfIn PDF document text
    • http://piwulag.sportsontheweb.net/54924980887.pdfIn PDF document text
    • http://zujuzerawijuk.medianewsonline.com/convert_to_word_using_nitro_pro.pdfIn PDF document text
    • http://morasuxod.getenjoyment.net/bayam_merah.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bawujirilo.epizy.com/b_tech_movie_malayalam_mp4.pdfIn PDF document text
    • https://s3.amazonaws.com/dakebesuvum/6832849764.pdfIn PDF document text
    • http://bitines.myartsonline.com/23344441465.pdfIn PDF document text
    • http://vibirokudod.myartsonline.com/inheritance_series_book_2.pdfIn PDF document text
    • https://s3.amazonaws.com/duzexefemosaxe/css_interview_questions_and_answers_github.pdfIn PDF document text
    • https://02274cc9-8b57-4441-be19-e46c089ec46b.filesusr.com/ugd/f11b8f_c3b1d101b9a94e9fab96e9e0689b191b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/ligole/67758394667.pdfIn PDF document text
    • https://cfecb619-c0f5-418d-ae9d-b1147643389f.filesusr.com/ugd/4cd51e_4b9df2b38a1446a69f62aafd242cda24.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/juzowilipi/sawuropetalalomis.pdfIn PDF document text
    • https://s3.amazonaws.com/tigewibejageju/40987116676.pdfIn PDF document text
    • https://2386e270-bd20-42c1-b3e5-1ba7eaa1d68d.filesusr.com/ugd/b4f0c6_a1c2d16d20ed44ffa6fcc28ad261c394.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fadadedezeker/28076245480.pdfIn PDF document text
    • https://d2faa26e-66ca-44cd-8f84-883624a71019.filesusr.com/ugd/dbbfd0_c76a1c9616494a47b8a325de25963205.pdf?index=trueIn PDF document text
    • http://xutagefev.epizy.com/vijamelalifa.pdfIn PDF document text
    • https://a2876ee3-c470-454a-91e2-e108d831033a.filesusr.com/ugd/e8dba5_91cb4dfd67834069b1a9f05e3acce5c5.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012af6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AF6 5140 bytes
SHA-256: 040bd1e71ad5894ec3b42c4f756c4a9d88d8e6e9ee155629ed0b6d7d1d71497c
font_01_sfnt_off00013c88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C88 3120 bytes
SHA-256: fde507d3e12ec33e68adf7e75fc7402ffd28b0db1492fb6dd1e3c49ab7b9519b
font_02_sfnt_off0001490d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1490D 14464 bytes
SHA-256: 09a6a78a98809bda6d11cb8055a8b7768a3231ee018d27abf714d6205f3db2b2

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