Malicious PDF — malware analysis report

Static analysis result for SHA-256 de122fc436582c41…

MALICIOUS

PDF

73.3 KB Created: 2020-11-12 14:23:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: ffad2978b1df57c97b943a1b22c34ae6 SHA-1: 16aa847de6382753d1e7f82e6183c24720be9aa2 SHA-256: de122fc436582c4177541be0c06b03c819b4c0586ca794533aaaf30b8ba6a2c2
214 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded links, with one identified as a known malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a mass of external links, suggesting a malicious intent to drive traffic to potentially harmful sites. The ClamAV detection and ML classifier further support its malicious nature, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://ggtraff.ru/123?utm_term=post+malone+psycho In PDF document text
    • https://cdn-cms.f-static.net/uploads/4387931/normal_5fa1b42d8ea33.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405895/normal_5fab211a6c29e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403938/normal_5f920b792d720.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381766/normal_5f9dfd0fd689b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368989/normal_5f9b452dd4749.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414352/normal_5fa0366512a5f.pdfIn PDF document text
    • https://kegegofelev.weebly.com/uploads/1/3/2/6/132681159/1311501.pdfIn PDF document text
    • https://vowijavig.weebly.com/uploads/1/3/4/3/134319359/wufipob.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467936/normal_5faa3cb1cd819.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381980/normal_5f8dd691d386b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368979/normal_5f8d0b1e7107a.pdfIn PDF document text
    • https://xizogezoki.weebly.com/uploads/1/3/4/7/134717510/b631e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • https://uploads.strikinglycdn.com/files/1cf8e375-12c2-4449-8de9-8d6629501aec/tazojapijuwedap.pdfIn PDF document text
    • https://s3.amazonaws.com/jesidofefe/nolugegibiweviwod.pdfIn PDF document text
    • https://s3.amazonaws.com/wopari/ketezu.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
    • http://www.gnu.org/licenses/gpl.htmlIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c905.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC905 5180 bytes
SHA-256: 134e11c9687e6ecd73154c016767abf2dd5d1798a438c321d2c934e8694b5e1a
font_01_sfnt_off0000da78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA78 8332 bytes
SHA-256: 0028bd97e2bf13f3dc24dec45b2e1717c3b922bfe83d4eaa897c1097b0606473
font_02_sfnt_off0000f19c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF19C 11644 bytes
SHA-256: b1781e977bc0d6fd50aedf9f3e6d834a3cbc94343f621ed9bcc4e766cf0b717b

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