Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3dbc0b55ec53219…

MALICIOUS

PDF

88.3 KB Created: 2021-03-11 20:01:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c9e96a182727ae58491ce690ebe58b52 SHA-1: d1082b737f8149c3fbb0982e4bbdd1e2772775dd SHA-256: f3dbc0b55ec53219995569d6f217bde2c5f3e61138272231df868d0c7ec432f1
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a technique often used to redirect users to malicious websites for phishing or to download further malware. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of outbound links, suggesting an attempt to create a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded URIs point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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=idealismo+e+materialismo+pdf
    • https://xadenekowote.weebly.com/uploads/1/3/0/7/130776743/xotuf-tifunuxewonamut-kujaj-dumijexegeromem.pdf
    • https://cdn-cms.f-static.net/uploads/4378155/normal_603a9efcd3ab2.pdf
    • https://static.s123-cdn-static.com/uploads/4460072/normal_5ff47aa873237.pdf
    • https://cdn-cms.f-static.net/uploads/4370777/normal_6049955fa6f37.pdf
    • https://cdn-cms.f-static.net/uploads/4454435/normal_603f1cce1a0ab.pdf
    • https://zesujixiti.weebly.com/uploads/1/3/1/3/131398447/98b945518a2c.pdf
    • https://static.s123-cdn-static.com/uploads/4451954/normal_5ffa1485eec7f.pdf
    • https://static.s123-cdn-static.com/uploads/4478148/normal_5ff3b104af210.pdf
    • http://nonuxuzelubit.22web.org/symbols_in_act_1_of_romeo_and_juliet.pdf
    • https://dutosagow.weebly.com/uploads/1/3/0/7/130775111/waxotinoxumib.pdf
    • https://cdn-cms.f-static.net/uploads/4413977/normal_6016b45a9af93.pdf
    • https://static.s123-cdn-static.com/uploads/4445754/normal_5ff3116abcaf0.pdf
    • https://cdn-cms.f-static.net/uploads/4485935/normal_60342ac6a4f68.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://zosubimonoz.rf.gd/cuadernillo_de_actividades_matematicas_segundo_grado_de_primaria.pdf
    • https://s3.amazonaws.com/degisapemifa/intertrust_spv_cayman_limited_annual_report.pdf
    • https://s3.amazonaws.com/fodose/aleks_math_exam_answers.pdf
    • https://s3.amazonaws.com/goveruduzewoxu/dell_emc_poweredge_r640_datasheet.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011c4c.bin
690b347386a936d4bb547eaf25d5d93f22175073844bbf6a270b315081ae2045		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11C4C 5124 bytes
font_01_sfnt_off00012da0.bin
93b4f93995803827153b2645fdef9b80652ddf5a20edb35c2e787d3da3200b4c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12DA0 11716 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.