Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d21d8d2dc173a0d…

MALICIOUS

PDF

72.2 KB Created: 2020-12-27 00:31:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 9b3461c1b81c5d946bd0f0fdfa58bd61 SHA-1: bb23a52a49e7409b2ae79873dc088474ef422e1d SHA-256: 9d21d8d2dc173a0d21b1abcf6bb72ff608e41ff0763db696b26b07283961ceef
214 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and an ML classifier, indicating it likely serves as a phishing or malware distribution vector. It contains a large number of embedded links, with at least one pointing to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool sometimes used to create malicious PDFs.

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/strik?utm_term=learn+to+sing+online+lessons In PDF document text
    • https://kalodutizifurul.weebly.com/uploads/1/3/4/5/134597908/15c540b39b01.pdfIn PDF document text
    • https://xavujome.weebly.com/uploads/1/3/0/7/130739328/3128347.pdfIn PDF document text
    • https://dejutuzalusabi.weebly.com/uploads/1/3/4/8/134869317/09b4f99ad360bc.pdfIn PDF document text
    • https://dutitujazekap.weebly.com/uploads/1/3/0/8/130814390/d142049ced.pdfIn PDF document text
    • https://magojumenuta.weebly.com/uploads/1/3/4/3/134361537/2035851.pdfIn PDF document text
    • https://tulugawaluga.weebly.com/uploads/1/3/0/9/130969515/fajigalima.pdfIn PDF document text
    • https://katolafafesol.weebly.com/uploads/1/3/4/4/134479470/93e06db55.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449788/normal_5fe71751c05dc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/e3ea69f3-0202-45f2-89a0-f31c06546f95/remud.pdfIn PDF document text
    • https://s3.amazonaws.com/setaxilitozuko/lewulanipidafedudefa.pdfIn PDF document text
    • https://s3.amazonaws.com/figidireki/refefopefifukovadenowevaz.pdfIn PDF document text
    • https://s3.amazonaws.com/mijedusovineti/zugezowatam.pdfIn PDF document text
    • https://s3.amazonaws.com/defipedibe/devodetogutizedo.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_off0000dffe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFFE 4792 bytes
SHA-256: 855c9b3ab95f81e8f60e265fb75bcd08f4ecb527cbe7469c98b3bb2c64241c5e
font_01_sfnt_off0000f05e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF05E 10584 bytes
SHA-256: fcfbb4219726740dbcf044888d460cea717a5d12d4240cf9aaa6e1e3ddce04af

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