Malicious PDF — malware analysis report

Static analysis result for SHA-256 b02b6e1c53d5a661…

MALICIOUS

PDF

78.9 KB Created: 2021-05-22 14:56:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 319cb48cb0c67d8e17b6f34f7fdc2cc3 SHA-1: 0301ef2d4435af105486b452e2943b51e76fa9ce SHA-256: b02b6e1c53d5a66122e02e9e5ceba1614287ccdaa52d9e2a00c7e808ace66f8f
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a large number of external links, many of which point to disposable hosting, suggesting a link farm used for phishing or malware distribution. One of the primary URLs, 'https://soxebez.ru/strik?utm_term=samsung+snk-b73040bw+user%2527s+manual', appears to be a lure for a user manual, likely to trick users into downloading malicious content. No scripts were extracted, but the PDF structure and numerous external links are indicative of a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://soxebez.ru/strik?utm_term=samsung+snk-b73040bw+user%2527s+manual PDF link annotation
    • https://rajepejejema.weebly.com/uploads/1/3/4/8/134860913/b0b290.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495385/normal_6048d7da00319.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368958/normal_6007ef151f825.pdfIn PDF document text
    • https://wurixexaf.weebly.com/uploads/1/3/4/8/134865586/700999.pdfIn PDF document text
    • https://nanupiwe.weebly.com/uploads/1/3/1/6/131606486/jajivalaxafan.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417817/normal_6045aa55698ec.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422367/normal_601fcefbd67f4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382406/normal_603bdf8bc9193.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495976/normal_5fc9eccd58f50.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425487/normal_600baa1aca6e8.pdfIn PDF document text
    • https://vikisoxez.weebly.com/uploads/1/3/4/7/134712259/dogedujuk_roguraze_wuxudagirizojam.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376380/normal_60555c6f0f1a0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461229/normal_6046b69ac55c8.pdfIn PDF document text
    • https://xipakopubax.weebly.com/uploads/1/3/5/9/135966228/kolebenepak.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418170/normal_5fdfd84803c18.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426697/normal_6031115b197ec.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/jejulurowev/34441011322.pdfIn PDF document text
    • https://s3.amazonaws.com/lonozote/vomukabewizazitipeka.pdfIn PDF document text
    • https://s3.amazonaws.com/vabedafozo/26126501909.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_off0000f447.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF447 5944 bytes
SHA-256: 141e5d81eb25774b31520d0909f872987f6d712e28fdf8a37154ff766d328928
font_01_sfnt_off0001089f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1089F 10920 bytes
SHA-256: f9a2cff49282d34e618f4acf5ba92fffc3be7ee8a3454a568389d9089729023d

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