Malicious PDF — malware analysis report

Static analysis result for SHA-256 2522ec5776b51e7b…

MALICIOUS

PDF

70.4 KB Created: 2020-12-11 01:07:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 29bf04aa09c54f02f7ea11fb76169613 SHA-1: a27a999412b4baed29916bb983c1966d88e664e0 SHA-256: 2522ec5776b51e7b40ba53b01adfa68af42401c8434abf65ed2befc9121bdbc0
214 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, with critical heuristics indicating it's a redirector and part of a link farm. One such link, 'https://ggtraff.ru/wb?keyword=boomsday%20puzzle%20lab%20guide', is flagged as malicious. The presence of embedded URLs and the ML classifier's high confidence score suggest a phishing or malware distribution attempt, likely initiated via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://ggtraff.ru/wb?keyword=boomsday%20puzzle%20lab%20guide In PDF document text
    • https://madimikelijexev.weebly.com/uploads/1/3/4/7/134717844/5874171.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387061/normal_5fbc81755139d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390052/normal_5f980157a9bfe.pdfIn PDF document text
    • https://lupunudarowujak.weebly.com/uploads/1/3/4/5/134599946/fapedibupumirilofev.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479678/normal_5fbdc28ccb60d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448731/normal_5fbc73e3a8893.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4502870/normal_5fcb9bf1aa5ba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403260/normal_5fb57225708e5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370530/normal_5fb787f709510.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460247/normal_5fbeda06ba98f.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/5fc36ff3c6d9645836323309/t/5fccf03e6f0099009e64c50b/1607266366914/967866156.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/284597e5-8f46-4441-8a1f-51ce1ab978ff/19525882720.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/024122d5-78b6-44f8-b145-1d855546b170/jivovilaniwowan.pdfIn PDF document text
    • https://s3.amazonaws.com/bubisifapagefe/vanowulufekobez.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_off0000d5a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5A4 5524 bytes
SHA-256: e40bdcc653bd4cdd999d6563b1063940ad529b1986dc7e114ec53f2df835418b
font_01_sfnt_off0000e86c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE86C 10776 bytes
SHA-256: dad070ed471e448cc908a015919bd8151a52a4919646aeb9de84aa8e0db3f59e

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