Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5be3c504381542a…

MALICIOUS

PDF

73.4 KB Created: 2020-12-28 07:45:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: eb2671d742392bee19d8637ecf80af40 SHA-1: 1ca4f4937dc301196192452576c23775a94f3e3c SHA-256: a5be3c504381542aae479a95c52299e68fbdc38ebd95c07b1decd7934f9e4485
164 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, many pointing to other PDF files, suggesting a link farm or SEO poisoning tactic. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://traffset.ru/123?utm_term=pedagogical+content+knowledge+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4407777/normal_5fcbd86283a3f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418401/normal_5fe39ea79fcfb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367633/normal_5fa04042ca88d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445106/normal_5fd2c13153add.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421199/normal_5fb6414fa22e7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369640/normal_5f8c76f67b10d.pdfIn PDF document text
    • https://puxefulido.weebly.com/uploads/1/3/1/3/131383426/woxaxa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476566/normal_5fe391c9eb148.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368474/normal_5faa51a6b91ca.pdfIn PDF document text
    • https://mamapesuwilataj.weebly.com/uploads/1/3/4/8/134857931/eeb6db3dbfd0c72.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/rezugekolaba/8267135280.pdfIn PDF document text
    • https://s3.amazonaws.com/seriposuj/ielts_general_reading_test_answer_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/divelikubapiwaj/bandar_malaysia_project.pdfIn PDF document text
    • https://s3.amazonaws.com/banula/zafulixofuremoz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/791c9eb5-42b3-4f59-a0a5-7979bf6132a5/pekufofebilafezujer.pdfIn PDF document text
    • https://s3.amazonaws.com/xapidajovaji/27332885277.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_off0000e237.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE237 5204 bytes
SHA-256: 223f17178c0473fe0ed39ba4a04bdcc4b43f8d686bfa29ce807ef03a004e6b9d
font_01_sfnt_off0000f41f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF41F 10668 bytes
SHA-256: 72a8ca9c8ef34b93cf0e750ddc9e696fa649a6edce2b56e437865044fa8a675f

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