Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8e08b2430233688…

MALICIOUS

PDF

66.6 KB Created: 2021-02-25 07:08:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 544c6e88973d06bb1655f01d52904e69 SHA-1: f4329a006b6ce54b36b47fcc97c919d33b578df3 SHA-256: a8e08b2430233688a48d2259b0a283f794d5bc1cb5c0b328dfce7e24e3d8da6f
186 Risk Score

Malware Insights

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

The PDF file contains a significant number of external links, many hosted on disposable domains, indicative of a link farm or SEO spamming operation. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to phishing sites or download further malicious content. While no scripts were explicitly extracted, the PDF structure and numerous external URLs point towards a malicious distribution or redirection scheme.

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://jottigo.ru/award?keyword=sandisk+8gb+clip+sport+mp3+player+%2528black%2529 PDF link annotation
    • http://bumasujofoj.getenjoyment.net/nipelir.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382192/normal_601e4f965c38e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475729/normal_600d6bb5b0e4d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368763/normal_60216cb621b8c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389616/normal_5ff371952e0b6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4401973/normal_5fecc9b1d4cfd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470224/normal_602f8818d623b.pdfIn PDF document text
    • http://kamikofonem.mygamesonline.org/adobe_acrobat_create_toolbar_acroiefavclient.dll.pdfIn PDF document text
    • http://vodabutopidaru.getenjoyment.net/42955633860.pdfIn PDF document text
    • https://xubivolimoba.weebly.com/uploads/1/3/0/7/130740090/2859184.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418170/normal_5fdfcb6dda506.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370560/normal_60109af7622ae.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425506/normal_5ffcd4ec77e89.pdfIn PDF document text
    • http://towufato.mywebcommunity.org/weber_spirit_e_310_2_burner_gas_grill.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4530937/normal_5fe24ccc2378b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zikoliduxa.atwebpages.com/rakozedovumam.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_off0000c4db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4DB 6316 bytes
SHA-256: dcc7c8d1d955d6d59c95fca6d1536cb421a00ed5f710efae4ede37a1508d9747
font_01_sfnt_off0000da56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA56 10252 bytes
SHA-256: 9007ddd21e0f557f0ccb5b13714c7e05e8497facfddff02edb9eb44f7d8ccc09

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