Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1daef67b1ff5c58…

MALICIOUS

PDF

124.6 KB Created: 2021-02-26 20:46:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 83eedf390fa7ad071dd7466abeb56af3 SHA-1: 5a2a21f82f6d0d01920b7b8de7cb8bfe8b8e633d SHA-256: c1daef67b1ff5c58df7ea8175a0d33d86bd60a03f88a3975f7dfc50f1b0cb55b
156 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, indicating a high likelihood of malicious intent. It contains a large number of external links, suggesting a link farm or a distribution point for further malicious content. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic strongly suggest this document is part of a campaign to manipulate search engine results or distribute malware via numerous linked PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jacksth.ru/strik?utm_term=is+it+wrong+to+pick+up+a+girl+in+a+dungeon+light+novel+volume+14 PDF link annotation
    • https://manujemupofux.weebly.com/uploads/1/3/0/7/130738512/majimem-bonazorinuwurus-sipef-dotevuf.pdfIn PDF document text
    • https://cdn.sqhk.co/kodivitedi/zhfghbE/13116829024.pdfIn PDF document text
    • https://nitikado.weebly.com/uploads/1/3/4/6/134660078/fezepadokasa_fipeb_mibegibibigawan.pdfIn PDF document text
    • https://rewesiriwo.weebly.com/uploads/1/3/4/3/134318955/bagibi-japok.pdfIn PDF document text
    • https://cdn.sqhk.co/ludozenidi/W2HvwBy/44438962183.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413567/normal_5fe53046352a3.pdfIn PDF document text
    • https://cdn.sqhk.co/sukijubese/DMjgYij/bomibi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393925/normal_5fe8ba31d5dc5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4401517/normal_6006fe51d7794.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457561/normal_5ff680398ab7c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483842/normal_60355c97780da.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482228/normal_6017156f50e11.pdfIn PDF document text
    • https://sumajodezidozi.weebly.com/uploads/1/3/3/9/133997227/ff4b5a542e614b3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470385/normal_5fffcb058cb37.pdfIn PDF document text
    • https://cdn.sqhk.co/togokitaz/gjbicxN/dopasududabapuxag.pdfIn PDF document text
    • https://xoxitugupara.weebly.com/uploads/1/3/1/3/131383959/2972815.pdfIn PDF document text
    • https://tixuxajus.weebly.com/uploads/1/3/2/6/132682254/f7648f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484376/normal_5fde6611de54a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00018e6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18E6D 8168 bytes
SHA-256: 312aabe019361a84749d2cff9b7cca1130c32f0564f5345e442026cf0bd5bc9a
font_01_sfnt_off0001aa1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AA1F 5780 bytes
SHA-256: 7019293b77f66128b4bb456279095e5f8adf32928c56f106f036318663ee4a64
font_02_sfnt_off0001bdd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BDD2 10376 bytes
SHA-256: 8d7909c9984f1e70676a2dac52dee53666e0e647dcb02d27cacc71fff50057c2

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