Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fb0432b2e2f13a8…

MALICIOUS

PDF

73.0 KB Created: 2021-01-28 07:11:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 0ff2e2ebe3e63e34c7a7d58be068fd80 SHA-1: e37ea84ee42ea73a26622f219038e0dd3e4a8164 SHA-256: 7fb0432b2e2f13a8c88bbd6253085d855cd16dd9e059ae9abbc5e6df91285547
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious intent. The PDF contains a large number of external links, suggesting a link farm or redirection to malicious sites. While no scripts were explicitly extracted, the PDF structure and the presence of numerous URLs point towards a phishing or malicious content distribution scheme.

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://jacksth.ru/wb?keyword=octopus%20tattoo%20meaning%20for%20guys PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4368759/normal_600acd2e7fc59.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4468812/normal_5fdf717acae8d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463812/normal_5fd7c6898d2c2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403817/normal_5ff32927afadf.pdfIn PDF document text
    • https://wadonado.weebly.com/uploads/1/3/4/6/134677460/bafuzuxu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444649/normal_5fe0d1bc39783.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378406/normal_5fd2837807e4e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413862/normal_5fe80fe31dd7c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454289/normal_5fe2bc597e293.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501201/normal_6000fb4575297.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403283/normal_5fff935905bed.pdfIn PDF document text
    • https://niniteju.weebly.com/uploads/1/3/0/8/130814631/worilafajedixi-xobubuzizanef-jevukexobabu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450048/normal_5fe624cdea732.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/pibajuwi/22505412675.pdfIn PDF document text
    • https://s3.amazonaws.com/lijulijowivaze/light_wood_platform_bed_with_headboard.pdfIn PDF document text
    • http://fonunegemo.epizy.com/razer_synapse_macro_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/wizidimawag/pofuzigetatilexozek.pdfIn PDF document text
    • https://s3.amazonaws.com/dekogamik/83489923787.pdfIn PDF document text
    • http://retesatitogeli.epizy.com/ruvoni.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_off0000e17a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE17A 5432 bytes
SHA-256: 6968a52a441e4bea5a9f1d40161014207a2e62def2e0df521efa8360df944554
font_01_sfnt_off0000f3eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3EB 10364 bytes
SHA-256: 700ccd2922156141b5f5a3081f70d5244094765579991592d92737eb9d84fa46

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