Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c6014926efe5043…

MALICIOUS

PDF

86.9 KB Created: 2021-02-01 14:53:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: c778196ad3e750dd3951f06851e5af87 SHA-1: 92e2286627f57500e5b92003b9583997dc20218c SHA-256: 4c6014926efe5043e77967c1727a1b5a7c517dbedc07b3864d1cc554c5d57a3e
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, many pointing to disposable domains, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to distribute further malware or phishing content. The embedded URLs and the nature of the link farm suggest this PDF was likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://jacksth.ru/123?utm_term=sexy+anime+maid PDF link annotation
    • https://demizuxikeb.weebly.com/uploads/1/3/4/0/134000208/5f9f86b4.pdfIn PDF document text
    • http://on24-system.club/ropilaselijogejeminf29h.pdfIn PDF document text
    • https://tozakewa.weebly.com/uploads/1/3/5/3/135398337/xizot.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452157/normal_5fd34ae48b2b0.pdfIn PDF document text
    • http://azakalaza3.xyz/kevifawawecpil.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461250/normal_5fd77fc08f777.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422894/normal_5fd1c328c392f.pdfIn PDF document text
    • http://ejqy.com/javejabubc4l86.pdfIn PDF document text
    • https://bedexupef.weebly.com/uploads/1/3/0/7/130775630/bd9e98.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402932/normal_5ff826d5427b6.pdfIn PDF document text
    • http://winoraama.space/zebra_crossing_sign_ukianqi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425256/normal_5fea37ed127b3.pdfIn PDF document text
    • http://sreview.online/37560852011ko9kp.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4456387/normal_5fe258e1e70df.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376371/normal_5fdc239b867ac.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484356/normal_6001c64b7e402.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480187/normal_600bfe3fbe4c7.pdfIn PDF document text
    • https://juxibawazorar.weebly.com/uploads/1/3/3/9/133997202/fozomuvagug-bokujidot.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448986/normal_5fc82d5db7c3c.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/ratixifo/classification_of_plants_information.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000101d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101D2 4936 bytes
SHA-256: 37057eee269f3048193b8d65da895f8623e79b214e721ab79a1a9178340b9ef3
font_01_sfnt_off0001129a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1129A 11428 bytes
SHA-256: 7ae7cb42ccfaad566dcd90cadf0a52bce518c1f9c0addb77970affcd1ee72138
font_02_sfnt_off00013933.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13933 16132 bytes
SHA-256: 4f6d6443d667672870c38ce4e1d364e29e61a0df6fd2d8217a47270b9fff04c9

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