Malicious PDF — malware analysis report

Static analysis result for SHA-256 c03a717ce7ba74b7…

MALICIOUS

PDF

72.1 KB Created: 2020-11-20 00:06:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 0b7ab97ccd8b7787df0dfcf9f4937df0 SHA-1: a0a157f7cc6bee47806700e84c8d61f78c0beb36 SHA-256: c03a717ce7ba74b74e5af814566506b4616597f2a343cf11045de5615d804717
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. 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 document body, though heavily obfuscated, appears to be a lure related to 'Saxon math course 3 cumulative test answers'. No scripts were extracted, but the presence of numerous external links indicates a high likelihood of malicious intent, potentially leading to phishing or malware download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

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=saxon+math+course+3+cumulative+test+answers+21a PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4472475/normal_5fa728729d1d2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445573/normal_5fa8a61d4733c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381551/normal_5fa0981c9b87a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388432/normal_5fa2c1a4b623c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366957/normal_5fa6a7e665f3e.pdfIn PDF document text
    • https://tobotegitemusir.weebly.com/uploads/1/3/4/6/134651307/bbd8e5a.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/xesigeze/65367852087.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1ff6dea3-f689-4420-8fdc-0b3c93077528/96290603453.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f97e0bad-b540-43f4-adef-d02754c4f656/baar_baar_yeh_din_aaye_song_download.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_off0000dc31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC31 5708 bytes
SHA-256: 4e7a9443506dc3207a00bbd653d530e5e31b3333d66d3f147fd4b617de031348
font_01_sfnt_off0000ef92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF92 10740 bytes
SHA-256: 1d68856642d6d85c2d462958dd57b584c15bcfb3ec254b2d5c949cd2d3a3cd81