Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6165971036b20e9…

MALICIOUS

PDF

106.0 KB Created: 2020-12-27 08:42:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: d48dd069bde0c57c97a70627f5fe6966 SHA-1: fd7e8be03cce2fef1791c0ebf07695b53bd9dc20 SHA-256: e6165971036b20e93487c1d52cbfe4ff5dc58c3e0572e465d92165df199266c5
214 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with at least two identified as malicious redirectors. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' and 'PDF_SEO_LINK_FARM' indicate a strong attempt to lure users to malicious sites. The ClamAV detection and ML classifier further support its malicious nature, likely serving as a phishing lure or a distribution point for further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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
  • 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://cctraff.ru/strik?utm_term=pixiv+english+users In PDF document text
    • https://xovadesunuzavam.weebly.com/uploads/1/3/4/4/134479636/4492798.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418796/normal_5fbd7ecf595fb.pdfIn PDF document text
    • https://dopikilazobowu.weebly.com/uploads/1/3/4/4/134488506/gapiwifazibir-nevez-vagosewewunili-jepol.pdfIn PDF document text
    • https://leketupafap.weebly.com/uploads/1/3/4/5/134527175/f37e8.pdfIn PDF document text
    • https://xoxujodega.weebly.com/uploads/1/3/4/3/134363828/duzaw_zapepunujod_girunasujuruwop.pdfIn PDF document text
    • https://kuxubujokug.weebly.com/uploads/1/3/0/7/130775750/3433525.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408471/normal_5fb775763fcec.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426080/normal_5faabe3b73318.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/cd19c90a-77cc-4522-9fd4-79432e452f81/24739099639.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3d2f771d-e16d-4d91-92cb-4019d5927765/86049481156.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/90dbc76b-07e5-48d2-8a2e-ff838d6deaf5/92163074020.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011a82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A82 17516 bytes
SHA-256: 1a7784dba9a896514662322b88622781fe11514579f80251360a0b7c68d7c642
font_01_sfnt_off000152b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x152B3 4864 bytes
SHA-256: 8bfe32fd397b6714bb238d491a87b92b8db90813eecb99aee88f12553d60a306
font_02_sfnt_off0001633f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1633F 6584 bytes
SHA-256: aa9348cfa225e3c6d2b87f4f7c71efdaeacbcaff41ad836dbe0b698a8709bf2d
font_03_sfnt_off000174a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x174A7 11220 bytes
SHA-256: 063194b2872d8c7df3b0cae8dd487ce95b93929ee4b12e70f55e9cf367203170

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