Malicious PDF — malware analysis report

Static analysis result for SHA-256 579c62abf1caf55e…

MALICIOUS

PDF

76.7 KB Created: 2021-03-15 18:31:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 633b7c738d8fccd0ae64b237f9f40c92 SHA-1: 96b820bcd254be60775eb7c8e14c5a2b1e1f7476 SHA-256: 579c62abf1caf55e32ef152bd103595f62e7c0b5026b2532a2fc4d0883063250
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting, suggesting a link farm designed to distribute malicious content. The primary malicious URL identified is 'https://xezojetit.ru/wix?keyword=clash+of+clans+magic+apk+mod', which appears to be a lure for a modified game application. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://xezojetit.ru/wix?keyword=clash+of+clans+magic+apk+mod PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4392651/normal_6021800fbafa7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4505687/normal_5ff65b01ea494.pdfIn PDF document text
    • http://ladekepevij.mygamesonline.org/11803583668.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368950/normal_5ffaeb39aa00d.pdfIn PDF document text
    • https://bifukumuvu.weebly.com/uploads/1/3/5/3/135347201/6899516.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4500453/normal_5fed5a067ce76.pdfIn PDF document text
    • https://kuweperiti.weebly.com/uploads/1/3/4/9/134904821/3615289.pdfIn PDF document text
    • http://nanamojuvimujo.medianewsonline.com/multiplying_decimals_video.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://711a90e7-97f2-4eab-8690-3003ec1e9b64.filesusr.com/ugd/a0905b_7626829f3a264c7caa0694407beeb123.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zonivezada/586507540.pdfIn PDF document text
    • https://d9226533-59f4-4737-ae77-cfa9cdee5378.filesusr.com/ugd/d7c203_50e3b82d9afe4d178073a55da8a80cf7.pdf?index=trueIn PDF document text
    • https://33fe1336-4051-433c-b691-b763732126dd.filesusr.com/ugd/6c8f37_369ab9c381e140caa6d6731be16358c4.pdf?index=trueIn PDF document text
    • https://c33c3ce4-fa2f-4f19-9477-7a801b41b29e.filesusr.com/ugd/ebbcbd_d3f0af3afc76484ba4f3882031ebaac0.pdf?index=trueIn PDF document text
    • https://3b0fe5ff-7f86-489c-8138-fc984e51136c.filesusr.com/ugd/bfd78a_3ed906e8ab474210ba52d38a3a184a34.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tiniruru/salazazozided.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_off0000e21a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE21A 5444 bytes
SHA-256: f84adb0ed85d5220afce15d89e6deb90e8dd730486aa1b3f98890e27e1fcf124
font_01_sfnt_off0000f47a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF47A 15396 bytes
SHA-256: 42d52855459d31b42e19494b188eadfbc345bfc0d9a5eac2c03fb2847a602f00

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