Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3e98d54315218f2…

MALICIOUS

PDF

75.6 KB Created: 2021-02-18 13:45:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 9ccdf735d80f204c10143af8275ff4e4 SHA-1: b0f4d735d9d99e7d818b56c25f86db9f2860410d SHA-256: c3e98d54315218f28e3a3ef9b4cd7e1e1d9ee9a6072e98021902abb1e11f3501
164 Risk Score

Malware Insights

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

The sample is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing lure. It contains a large number of external links, many pointing to PDF files, suggesting a link farm or a method to distribute further malicious content. The heuristic 'SE_INVOICE_LURE' indicates the document body, though heavily obfuscated, likely attempts to impersonate an invoice or payment request to trick users into clicking the embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://baarspo.ru/aws?utm_term=do+salvation+army+employees+pay+taxes PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4385863/normal_5fd05b7feb33c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476765/normal_5ffaa8e3737e2.pdfIn PDF document text
    • https://giliwafe.weebly.com/uploads/1/3/4/0/134016831/e71aa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389106/normal_5fce2d6d28e80.pdfIn PDF document text
    • http://itclick.info/liwimafoboranc7t83.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408188/normal_5fe8f5b02a6b0.pdfIn PDF document text
    • https://kikezisukoka.weebly.com/uploads/1/3/5/4/135400991/suguxuribiboj_gigigilibigeju.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4443356/normal_5fcc75b348b67.pdfIn PDF document text
    • https://xasamaxubema.weebly.com/uploads/1/3/5/3/135387487/fivik.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464539/normal_5fd2192ccb667.pdfIn PDF document text
    • https://xomupufemi.weebly.com/uploads/1/3/4/3/134322732/kunovagiwefevuligil.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/jedaxopopuko/1128528012.pdfIn PDF document text
    • https://s3.amazonaws.com/mesotodimus/motion_graphs_3_worksheet_answers.pdfIn PDF document text
    • http://jarobifuxoletow.rf.gd/58880373212.pdfIn PDF document text
    • http://powosegunivu.epizy.com/12714782474.pdfIn PDF document text
    • http://fasudum.rf.gd/bumblebee_hd_wallpaper.pdfIn PDF document text
    • https://s3.amazonaws.com/jeponowon/ginawulab.pdfIn PDF document text
    • http://sixosotonipo.epizy.com/mla_citation_website_format.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_off0000ea12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA12 5192 bytes
SHA-256: 15821586f7599ea7ab8b5da82ede619f42002c7a86bf869b479fc28bc063117c
font_01_sfnt_off0000fbbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBBC 10940 bytes
SHA-256: 7cf5d91d288de029d7c8fa58555cc845cbd74173a088c54a545637f00b796d8d

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