Malicious PDF — malware analysis report

Static analysis result for SHA-256 d072781da6c461c8…

MALICIOUS

PDF

63.5 KB Created: 2021-02-06 00:29:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: a981d1b54a9ccbce6f1ed4fa09db63e0 SHA-1: 11aadad9afdd83e9a787145b2f0b5a5624395ece SHA-256: d072781da6c461c88232a67d78cbf75e5229c2de2f63e257fb65556ea9a63cb8
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including ClamAV and an ML classifier. It contains a large number of external links, characteristic of a link farm or phishing campaign, directing users to various PDF files hosted on external domains. The embedded URLs suggest an attempt to redirect users to malicious content or phishing sites.

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
  • 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://druttle.ru/123?utm_term=a+first+course+in+complex+analysis+with+applications PDF link annotation
    • https://cdn.sqhk.co/sileluzorupo/Naicif7/bovonazatamonenufabiw.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412778/normal_5fde4ea8956fe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459785/normal_60165fcf65c9d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367951/normal_600eac2b10d7e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473654/normal_6013cf2610479.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476765/normal_5fd78da270314.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391896/normal_5fe8e993985a8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4406464/normal_5ffb8f01c045c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471273/normal_5fd30f38e2371.pdfIn PDF document text
    • https://xuwumiguxapizif.weebly.com/uploads/1/3/0/7/130739656/boluvuliluzepabum.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403274/normal_6007b2f15bbf7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470399/normal_5fe8360d6cf34.pdfIn PDF document text
    • https://cdn.sqhk.co/pedidagow/hhfthha/xotibatumolifaxifigu.pdfIn PDF document text
    • https://milakixu.weebly.com/uploads/1/3/1/4/131483020/povejarikikem-vipefuj.pdfIn PDF document text
    • https://cdn.sqhk.co/pugirunosamo/hjisCAf/78478732018.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427282/normal_5ff043a3d0134.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000bca6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCA6 5508 bytes
SHA-256: 78cd98902eeacabf057730ad5d85170de95a4693a536368ec88d2d38182dd139
font_01_sfnt_off0000cf55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF55 9892 bytes
SHA-256: 5531cad95641d4f72bad29e444fbcff996b59fa67dfe05b1a0c78e526b8cde42

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