Malicious PDF — malware analysis report

Static analysis result for SHA-256 83b13804681ef599…

MALICIOUS

PDF

71.1 KB Created: 2020-11-18 19:50:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 74a1ffffb19ccdf86298242ccbe75abd SHA-1: be3de0633a31ca54ec26731f661f749690bde0aa SHA-256: 83b13804681ef599f5854d6df61abbdf448e99b71ab47b4b5d412f7cc2271177
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to Weebly-hosted PDFs, suggesting a link farm or SEO manipulation tactic. One of the primary external links, 'https://trafficel.ru/123?utm_term=identify+your+breyer+stablemates', is flagged as suspicious. While no scripts were explicitly extracted, the PDF structure and the presence of numerous external links indicate a malicious intent to redirect users, potentially for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://trafficel.ru/123?utm_term=identify+your+breyer+stablemates PDF link annotation
    • https://kupanonul.weebly.com/uploads/1/3/4/6/134682697/40a5e5.pdfIn PDF document text
    • https://lupigufenof.weebly.com/uploads/1/3/4/5/134509144/pijozulerimuripu.pdfIn PDF document text
    • https://gadolelexuzited.weebly.com/uploads/1/3/4/4/134486477/59f38ba68eff0b4.pdfIn PDF document text
    • https://xuxefakeni.weebly.com/uploads/1/3/4/2/134234722/pobarelu-gepefebiv-dibiseruj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408981/normal_5f93881be2f26.pdfIn PDF document text
    • https://gokajafiwewafij.weebly.com/uploads/1/3/4/3/134314986/fawojeronojik_musinedubapiji.pdfIn PDF document text
    • https://dusexitope.weebly.com/uploads/1/3/4/6/134646398/960b96b0e.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/jofunozuzof/upper_gastrointestinal_bleeding_guidelines_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/xanebavifamopez/thermal_energy_worksheets_grade_3.pdfIn PDF document text
    • https://s3.amazonaws.com/xebuvuwov/74941865473.pdfIn PDF document text
    • https://s3.amazonaws.com/tirimofufemukat/kakegarojefebodonekilinos.pdfIn PDF document text
    • https://s3.amazonaws.com/wibedubosateg/57500212109.pdfIn PDF document text
    • https://s3.amazonaws.com/sefukirexuwekij/9162389752.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_off0000d8c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8C5 5232 bytes
SHA-256: 91792dcbf98a53a48955cdc3ae18033ab28985fe933dfd8d21b42ec908bf52d8
font_01_sfnt_off0000ea86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA86 10796 bytes
SHA-256: ae17de162855ff58423d800f2ba73b02427e8c9eb0a2544756c3ecd57eb828c0

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