Malicious PDF — malware analysis report

Static analysis result for SHA-256 93c85f1be12cba1a…

MALICIOUS

PDF

65.7 KB Created: 2020-12-15 23:47:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 644adec1ae092e391222c6b2328d5448 SHA-1: 712d8fdd5ed40d12d0061821de052d39fab84c2c SHA-256: 93c85f1be12cba1a982028aa1db86c7db2d49fe0c2b0403c116aaa644286fc19
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous links to external websites, with at least one identified as a known malicious redirector. The 'DOC BODY' content, though heavily obfuscated, suggests a lure related to a 'chemical engineering reference manual'. The presence of PDF-specific heuristics like 'PDF_MALICIOUS_REDIRECTOR_LINK' and 'PDF_SEO_LINK_FARM' strongly indicates a phishing or malware distribution attempt. No scripts were extracted, but the overall structure points to a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://cctraff.ru/123?utm_term=chemical+engineering+reference+manual In PDF document text
    • https://cdn-cms.f-static.net/uploads/4470221/normal_5fb84117d1018.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418379/normal_5fd1c096e6644.pdfIn PDF document text
    • https://zajasonasijo.weebly.com/uploads/1/3/4/6/134627958/tazavu.pdfIn PDF document text
    • https://pafuwaron.weebly.com/uploads/1/3/4/3/134385690/c18c83ebc0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483361/normal_5fb9834459e7b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417980/normal_5fa6f8c3b2469.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427538/normal_5fb9392511838.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fc553571c8c7413144f5d77/t/5fccd6d8eb18547f4b835c17/1607259871444/reboziwupofu.pdfIn PDF document text
    • https://s3.amazonaws.com/juzewojavomofew/bengali_hindu_religious_books_free.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc571e9abaecd331840d47e/t/5fc6afad173fb5383b912b8c/1606856622750/super_mario_world_2-_5_star_coins.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc168c927a199023ab8f22b/t/5fc2eaf964571256549cee0b/1606609657599/pegazevinilar.pdfIn PDF document text
    • https://s3.amazonaws.com/lakadutof/portadas_para_word_formales_doc.pdfIn PDF document text
    • https://s3.amazonaws.com/xalasawu/22387265654.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_off0000c64c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC64C 5020 bytes
SHA-256: 0551e60a40ee9e537d26e175bd17c5cbed411c49621528900b60b1efe0d6e058
font_01_sfnt_off0000d734.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD734 10208 bytes
SHA-256: e50d5d50739db120f6c972a467bc148fa67fe4a1611fb00bb84e8594fbdbc1d3

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