Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf57773481af5ca5…

MALICIOUS

PDF

85.2 KB Created: 2021-02-27 17:29:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 0ce738fcbfa3301069db4177182d90c1 SHA-1: a03460bc0264cd90293fb00e13725569d604bd27 SHA-256: cf57773481af5ca5e2237d3fcd45e901f46e6653f87e189b3cae84e04785a38b
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning model indicated a high probability of maliciousness. The heuristic 'PDF_SEO_LINK_FARM' indicates the presence of numerous external links, with one pointing to 'http://rikovaniroxatox.rf.gd/bopumewataxiboravotaxuxa.pdf'. The embedded URL 'https://vilenefex.ru/wix?keyword=ucsd+cse+140+reddit' also suggests a link farming or phishing attempt.

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://vilenefex.ru/wix?keyword=ucsd+cse+140+reddit PDF link annotation
    • https://cdn.sqhk.co/bewewojiwo/j9GJIhd/79690003311.pdfIn PDF document text
    • http://biggymstoe.com/sownictwo_biznesowe_angielski7nfl9.pdfIn PDF document text
    • http://felejus.iblogger.org/billingsley_creek_fishing_report.pdfIn PDF document text
    • https://cdn.sqhk.co/patagarinixa/eJpjgij/30862247289.pdfIn PDF document text
    • https://cdn.sqhk.co/sosobita/Auzgf4m/sosokawux.pdfIn PDF document text
    • http://nupigit.22web.org/24817792890.pdfIn PDF document text
    • https://sudomudes.weebly.com/uploads/1/3/0/8/130874284/lesonil.pdfIn PDF document text
    • https://fisokupavunimi.weebly.com/uploads/1/3/4/4/134469682/acfa696ba837ea.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rikovaniroxatox.rf.gd/bopumewataxiboravotaxuxa.pdfIn PDF document text
    • https://s3.amazonaws.com/wobuzisibal/52648890562.pdfIn PDF document text
    • https://s3.amazonaws.com/dazifozixawus/33886799008.pdfIn PDF document text
    • https://s3.amazonaws.com/jalasilunaz/ruxitonosofutofuluzuwax.pdfIn PDF document text
    • https://s3.amazonaws.com/pirosisob/64384308486.pdfIn PDF document text
    • https://s3.amazonaws.com/xasovewipeje/muvokari.pdfIn PDF document text
    • https://s3.amazonaws.com/vavale/asma_ul_husna_mp3_video_download.pdfIn PDF document text
    • https://s3.amazonaws.com/kujapomib/how_to_replace_ryobi_18v_weed_eater_head.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_off0000f878.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF878 4964 bytes
SHA-256: 411d0aab6ef70348c225ca85ed0b2559a88dd9a18e8322c5bf56b6613b2f26a6
font_01_sfnt_off00010979.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10979 10816 bytes
SHA-256: d87d3582e09a162d14f3a8755041ad1e9ac98e22e00f8478828b1c70759e686c
font_02_sfnt_off00012e95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E95 17428 bytes
SHA-256: 9d9519e0f7be9c9377b5795ea955af4f4846dc294f8e8a4a907861bdc569f41e

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