Malicious PDF — malware analysis report

Static analysis result for SHA-256 362d14e52e74a0df…

MALICIOUS

PDF

75.0 KB Created: 2021-02-05 04:42:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 987c2fa5f637a7e98c557c2835e7fa81 SHA-1: ee72d2647ecb0b4c8ff5ea934b503e93ea99fbbd SHA-256: 362d14e52e74a0df8cecc9b6ed764306689f78df08ba68bc2eb890dadaa53bd1
214 Risk Score

Malware Insights

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

The PDF contains numerous links to external PDF files, indicating a link farm designed to manipulate search engine results or distribute malicious content. One critical heuristic identified a link to known malicious redirector infrastructure, suggesting a phishing or malware distribution attempt. The ML classifier strongly flagged this PDF as malicious, and ClamAV detected it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/aws?utm_term=teoria+de+aprendizagem+cognitiva+pdf In PDF document text
    • https://static.s123-cdn-static.com/uploads/4424985/normal_5fe05c66bdf99.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413585/normal_5fc810e4c3324.pdfIn PDF document text
    • https://zedimubaxujejit.weebly.com/uploads/1/3/4/7/134715534/3c1521affdb7f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417314/normal_600275d020ed2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488141/normal_6011ace62dad3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464724/normal_600e62cf3f6a1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4456399/normal_5fc667ff29039.pdfIn PDF document text
    • https://sodefabufu.weebly.com/uploads/1/3/4/4/134473286/6901716.pdfIn PDF document text
    • https://tijagure.weebly.com/uploads/1/3/1/3/131398232/fc2d007a42eab12.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484097/normal_6007e4a7bcd35.pdfIn PDF document text
    • https://zojegidaluvimov.weebly.com/uploads/1/3/4/1/134109086/838313.pdfIn PDF document text
    • https://bugituwixumanuz.weebly.com/uploads/1/3/4/7/134722584/0e7d1aeb12d4.pdfIn PDF document text
    • http://deutschebank-meine.com/pufaxudakimiw676zy.pdfIn PDF document text
    • https://faliroralomi.weebly.com/uploads/1/3/0/8/130874474/kewebujomukevuwaba.pdfIn PDF document text
    • https://dosijusesuxola.weebly.com/uploads/1/3/4/3/134305349/7846090.pdfIn PDF document text
    • https://livorenofog.weebly.com/uploads/1/3/1/1/131163774/kafebuvepopulujagik.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/fefurorobumi/88854152120.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_off0000e4c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4C6 5324 bytes
SHA-256: af19c3affd50f87619734fdf66d8c6870c7cfb37ebef25d24107c95709a56e0a
font_01_sfnt_off0000f6e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6E6 12640 bytes
SHA-256: 2f7ea9880c07a25a099a0753532d5e163d60ab79ee82157f6fdbb2a6326128c5

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