Malicious PDF — malware analysis report

Static analysis result for SHA-256 1859f35b5077f372…

MALICIOUS

PDF

79.2 KB Created: 2021-03-02 09:28:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 97846a3005f74e70abb8a18af6e857ae SHA-1: cf862059479f91b3191e7380d486f1f911f78c4f SHA-256: 1859f35b5077f372bd322c4580d49c2eae5733cf615695e5a6e14b0af25cc3f8
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to PDF files, suggesting a link farm or SEO poisoning tactic. One of the embedded URIs, 'https://midufefew.ru/strik?utm_term=john+maxwell+5+levels+of+leadership+assessment', is likely a lure to a malicious site. The ML classifier and ClamAV both strongly indicate maliciousness, consistent with a phishing or malware distribution campaign.

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://midufefew.ru/strik?utm_term=john+maxwell+5+levels+of+leadership+assessment PDF link annotation
    • https://bibomezu.weebly.com/uploads/1/3/2/7/132710601/gowijejewipab-lebolawotaju-dazuva-zefoliked.pdfIn PDF document text
    • https://fimegelepa.weebly.com/uploads/1/3/3/9/133999933/febararepu_nodiku.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374689/normal_6005cad4d85d3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384159/normal_602188e835cfd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385620/normal_603353082ab97.pdfIn PDF document text
    • https://dapalijika.weebly.com/uploads/1/3/0/7/130738969/muxixu_nexewemujajo_migisebed.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388842/normal_60044abe75edc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382790/normal_6008fc31c4cfe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480598/normal_600b2158279d2.pdfIn PDF document text
    • https://rigonabex.weebly.com/uploads/1/3/1/4/131483185/dunesu.pdfIn PDF document text
    • https://womijepadake.weebly.com/uploads/1/3/4/4/134476187/f0097024ce1a5c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408464/normal_5fcafa7686364.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482629/normal_5fd7ce7ede852.pdfIn PDF document text
    • https://baduxobenef.weebly.com/uploads/1/3/0/7/130739850/votogabij.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393772/normal_602533e8a8edc.pdfIn PDF document text
    • https://mufisifarugevap.weebly.com/uploads/1/3/4/5/134595961/weluzumoto.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365539/normal_5ff1ccb23fd9e.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/kavalukato/anaganaga_punnaga_song.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_off0000f877.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF877 5612 bytes
SHA-256: 255de08089236d2f5e3c18fa90307816b170c5e5a6ddcbe4bf31ef9c99906d66
font_01_sfnt_off00010b7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B7F 10596 bytes
SHA-256: e6e220d1006f9d2f1bfb2de9712e8a36739aa9dff2ebffd5774024dd1b145ab1

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