Malicious PDF — malware analysis report

Static analysis result for SHA-256 d68b01ef85280ec5…

MALICIOUS

PDF

76.3 KB Created: 2020-11-13 16:13:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 4597395a602c91aee14c1d6d5e70e066 SHA-1: 9c773a14213c39d5119fdab1a4d1ff977d29b29a SHA-256: d68b01ef85280ec5a5cd6fc5f264e0e1ab151e1d742a9adf3847d7d4e266a048
214 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 embedded URLs, with one heuristic specifically identifying it as a 'PDF_SEO_LINK_FARM'. Another heuristic flags a link to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these links.

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://gettraff.ru/aws?utm_term=anemometer+how+it+works+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4389801/normal_5fab0de33c083.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368748/normal_5f87f6239ca39.pdfIn PDF document text
    • https://rufilepevaga.weebly.com/uploads/1/3/4/4/134444742/lepez.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373983/normal_5f97b3932318c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380530/normal_5fa4a6979ee24.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370062/normal_5f8b55a67cd29.pdfIn PDF document text
    • https://voteriboxovoviv.weebly.com/uploads/1/3/4/3/134352377/gutabugilikudinusi.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/tapexiw/zamarefugud.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fc8fc159-8979-40f8-b6c9-47c6ed03dec5/lowokazijavaxilefi.pdfIn PDF document text
    • https://s3.amazonaws.com/xidulumexi/zilemapaxunepabon.pdfIn PDF document text
    • https://s3.amazonaws.com/vavabi/antropoloji_kitap.pdfIn PDF document text
    • https://s3.amazonaws.com/xenavuxa/monadoxojuj.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_off0000ef20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF20 5184 bytes
SHA-256: f921688a5c0e588640def5ef31e8925dbaa4bde13e117788f4564bee95b39ac6
font_01_sfnt_off000100af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100AF 10644 bytes
SHA-256: 98ef48afc082024cc91fbb6590eac9ac35eb49b19c9779b070c261e9fef49002

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