Malicious PDF — malware analysis report

Static analysis result for SHA-256 223c59575b48d602…

MALICIOUS

PDF

78.3 KB Created: 2021-04-05 01:12:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 13f544441f62c33ad85f2eeb8a7c9086 SHA-1: 22b0576f857afac42dd1aaf0e0729642371d5380 SHA-256: 223c59575b48d60261381c6289b0f443f891e280d75506957ea04da2e126dd24
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to other PDF files, suggesting a link farm or redirection mechanism. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • 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.
  • 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://xajibur.ru/123?utm_term=spreadsheet+file+extension+types PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4467286/normal_5fcd5fd0351ba.pdfIn PDF document text
    • https://gobebirerelimi.weebly.com/uploads/1/3/4/6/134651667/jirapisemed-zamevewib-rusuzaso.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391009/normal_5ff3ccb0496e7.pdfIn PDF document text
    • http://wavarev.22web.org/multiplying_and_dividing_integers_word_problems_worksheet.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401505/normal_601dff432c65e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366389/normal_6026d86d2f17a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388037/normal_5fc738f18484b.pdfIn PDF document text
    • https://diziwupufetut.weebly.com/uploads/1/3/4/4/134477772/8918643.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415534/normal_6051ca4c7cdae.pdfIn PDF document text
    • https://kigadipokifexi.weebly.com/uploads/1/3/0/8/130813079/412b0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495393/normal_6055ac88b05bf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380395/normal_5fd05c9161790.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417023/normal_601d512769a7a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389355/normal_602824d7e539f.pdfIn PDF document text
    • https://xasatodifugo.weebly.com/uploads/1/3/4/4/134439571/dosaj-mezugem-topoxol-tisegulobaroxur.pdfIn PDF document text
    • https://zujedezagepom.weebly.com/uploads/1/3/0/8/130874220/c2f210338a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486748/normal_5fe400580baf9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425209/normal_6000ed3ee8813.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417025/normal_60047dcfb3667.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402517/normal_5fc88199df9a3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478430/normal_5fdd5bde92ed2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rodixotezogas.rf.gd/zerenuzitorirugik.pdfIn PDF document text
    • http://xumametubedax.rf.gd/64346710254.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_off0000f3df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3DF 5404 bytes
SHA-256: 656ea047c5193d0481bfb44b5786c666ac66cfcfd81c98cd9dbaf2d5ea7813fc
font_01_sfnt_off00010644.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10644 11072 bytes
SHA-256: 0fc9931473d7e092a3db715ba4cd94ca48108a19a77e83a67e867fef9cf3146f

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