Malicious PDF — malware analysis report

Static analysis result for SHA-256 acef584e6a55af22…

MALICIOUS

PDF

77.6 KB Created: 2021-03-24 12:46:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 124e2398a39982eb97661b38c04734a2 SHA-1: 900e25621053baf9d460622e104a4b4517ff6fc9 SHA-256: acef584e6a55af22cc6b4823267da7d2bf1c0bef8ad68f951e135fdc3a50d6f7
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified as a link farm. Several heuristics indicate this is a SEO link farm and a disposable link farm, suggesting a malicious intent to manipulate search engine rankings or redirect users to potentially harmful content. ClamAV also detected this file as Pdf.Phishing.Trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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.
  • 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 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://nipisod.ru/strik?utm_term=rebecca+daphne+du+maurier+critical+analysis
    • https://talovilivakalod.weebly.com/uploads/1/3/5/3/135326419/7556714.pdf
    • http://pipavomiz.iblogger.org/applied_mergers_and_acquisitions.pdf
    • https://cdn-cms.f-static.net/uploads/4480397/normal_5fd7ceed7f986.pdf
    • https://wujumumokujot.weebly.com/uploads/1/3/4/6/134613036/0347e7.pdf
    • https://gesivakegozuk.weebly.com/uploads/1/3/4/7/134768451/juvijavuzokom.pdf
    • https://static.s123-cdn-static.com/uploads/4366399/normal_5fedf5c879a7b.pdf
    • http://nemurirewokow.iblogger.org/misif.pdf
    • https://dapalirodo.weebly.com/uploads/1/3/1/4/131483520/zeniforenapisul.pdf
    • https://cdn-cms.f-static.net/uploads/4366311/normal_601bbbbe3572f.pdf
    • https://sisasava.weebly.com/uploads/1/3/0/7/130738988/fomajo-nobin.pdf
    • https://gugeropufil.weebly.com/uploads/1/3/0/8/130874104/2158832.pdf
    • https://sirunolova.weebly.com/uploads/1/3/5/3/135303996/natetolaxijoma.pdf
    • https://lufavivuda.weebly.com/uploads/1/3/4/3/134340228/xitobonawezudidi.pdf
    • https://kugixixubeleji.weebly.com/uploads/1/3/4/3/134324677/guwodezujoxa.pdf
    • https://static.s123-cdn-static.com/uploads/4473384/normal_5ff435930bb1a.pdf
    • https://fewabupa.weebly.com/uploads/1/3/4/5/134584226/5809037.pdf
    • https://lenexemumuvag.weebly.com/uploads/1/3/1/4/131438583/4747937.pdf
    • https://juxapokidopelif.weebly.com/uploads/1/3/1/6/131606881/1031098.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://larisakexifa.epizy.com/86700197607.pdf
    • https://d70b1dc8-7d09-4148-9854-e6a7cae1b87b.filesusr.com/ugd/5899d5_2330c3a0aa2a48a5a6f529d4cb8e890d.pdf?index=true
    • http://fupisemari.epizy.com/fopedimu.pdf
    • https://1527c8d3-3321-4e9f-872f-e2bebb57bac2.filesusr.com/ugd/bf2d42_4899ab1e662040b88a64b8df00576374.pdf?index=true
    • http://xoxinazur.rf.gd/35483763513.pdf
    • https://0ca3454e-05ac-49fc-8d00-644b1af7be3c.filesusr.com/ugd/8bf3fc_c248951d40194ec6a3e7c092c6fe8f42.pdf?index=true
    • https://0df6220b-9630-4647-aab6-0d9db69b9d59.filesusr.com/ugd/8b97dd_bfba19bd255a4ed08c6b4c6a5ebe2c3c.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f192.bin
78d40f9aafb41f76b66a0351450b30e94748272bd305c960c9ef711e4936bda3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF192 5560 bytes
font_01_sfnt_off00010454.bin
b26ab81175935e970974cbd1a6f592a6f38064c53c170829794539306632c1ba		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10454 10804 bytes

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