Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3b067ac6c7e4aa7…

MALICIOUS

PDF

75.0 KB Created: 2021-03-03 16:58:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: a1f4cea4e69a6f8d5f4d26f62b5c490c SHA-1: 3a741dcd20b242750738461ffe960081189aa20c SHA-256: c3b067ac6c7e4aa77353feaa3a55fa288891cdb7d0decab2f6e41891670d45d9
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 potentially malicious domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded URLs are likely used to redirect users to phishing sites or download further malicious content.

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://baarspo.ru/strik?utm_term=thermaltake+core+v1+cube+case+schwarz+mini+itx PDF link annotation
    • https://xovobinawulum.weebly.com/uploads/1/3/4/8/134883327/sexekaganadato.pdfIn PDF document text
    • http://fejukoturig.medianewsonline.com/how_to_fix_kenmore_washer_leaking_water.pdfIn PDF document text
    • http://guzexesuge.mypressonline.com/old_yeller_free_download.pdfIn PDF document text
    • https://cdn.sqhk.co/romilononove/jfic2gj/sawupezuwekabexunagoda.pdfIn PDF document text
    • http://lewijufe.sportsontheweb.net/43403975753.pdfIn PDF document text
    • https://cdn.sqhk.co/jabakujivim/vgQgilN/62232066936.pdfIn PDF document text
    • https://bebadivinokad.weebly.com/uploads/1/3/4/6/134604253/2982046.pdfIn PDF document text
    • https://cdn.sqhk.co/gonolesuzam/b95gelm/77196824643.pdfIn PDF document text
    • https://vebilikowuti.weebly.com/uploads/1/3/2/7/132740371/678e1e5c8901f.pdfIn PDF document text
    • https://zupitexugavasol.weebly.com/uploads/1/3/0/9/130969618/wedozasijigisalufero.pdfIn PDF document text
    • https://nirixebuwema.weebly.com/uploads/1/3/5/9/135990662/9711964.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/robumuduluwise/64545138108.pdfIn PDF document text
    • https://s3.amazonaws.com/midaguvimabof/gixumamogigeb.pdfIn PDF document text
    • https://s3.amazonaws.com/jajoxulabojaso/psd_website_templates_size.pdfIn PDF document text
    • https://s3.amazonaws.com/jodabiladezot/sujoxukorazeliresozib.pdfIn PDF document text
    • https://s3.amazonaws.com/kelukakeb/how_to_prevent_baiting_social_engineering.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_off0000ded7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDED7 5516 bytes
SHA-256: 4f2d8b321d684d89b4036c3ea953d6008df7787307fe2fc16e69f66526d8d97a
font_01_sfnt_off0000f18a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF18A 14556 bytes
SHA-256: 199f8e399e74ab12e0f8c83ad0583f0f4c9b27c084ae6228560c5cf8b0c2d2ee

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