Malicious PDF — malware analysis report

Static analysis result for SHA-256 2118729d224bbdc4…

MALICIOUS

PDF

94.8 KB Created: 2020-11-10 03:54:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: bd40ee83745ae3e295c2c1f75cf2b28f SHA-1: 18feb2c9b8f6d825df28fbd653b1ed51093a9747 SHA-256: 2118729d224bbdc4d89c04a652b9056717f5f0cb55162ec355d453cdde4b8882
156 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded external links, as indicated by the PDF_SEO_LINK_FARM heuristic. The primary URL, https://traffset.ru/strik?keyword=kim+yong-chul+samsung, suggests a potential phishing or SEO spam campaign. ClamAV detection as Pdf.Phishing.Trojan further supports its malicious nature. No scripts were extracted, but the extensive linking pattern points towards a malicious intent to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://traffset.ru/strik?keyword=kim+yong-chul+samsung PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4369191/normal_5f8e29e307e32.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370270/normal_5f92c15e4172b.pdfIn PDF document text
    • https://papunagaku.weebly.com/uploads/1/3/1/3/131384156/memakemumiw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454561/normal_5fa543dc7e67c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366622/normal_5f880af62c15a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383156/normal_5fa11e3e105c9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377120/normal_5f9b37bf32825.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372384/normal_5f90cf0e94bfa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377102/normal_5f8af5017f0d9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366350/normal_5f871ac6da26b.pdfIn PDF document text
    • https://bizetuxerupa.weebly.com/uploads/1/3/0/8/130873791/6632857.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421473/normal_5fa14ab7a11a0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369183/normal_5fa10b8824018.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376088/normal_5fa9e48c858a9.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/kavitokolezub/entrepreneurship_notes_for_bba.pdfIn PDF document text
    • https://s3.amazonaws.com/subud/48169454848.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/456fddf8-4f1b-426b-8f0c-a8e21fccf198/pho_bac_hoa_viet_restaurant_stockton_ca.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fcf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCF2 6444 bytes
SHA-256: d22cac10f319a008d3a3a07023c4d76637f032ea38873d2387d8d1eced661efe
font_01_sfnt_off00010cb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CB3 6704 bytes
SHA-256: 3021cb6950000cf389de278b3207c7bca901c6259f207eed3511ce023ce28631
font_02_sfnt_off00012356.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12356 5220 bytes
SHA-256: aaa2962d0223d803973db5557d507e5e9218d14f16facebc2be9ebc24a39a999
font_03_sfnt_off00013517.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13517 12412 bytes
SHA-256: f9d7f802e2364e4bfc77a7c1dc7b0f32ccfb43fecb67569a828529e2edd4e64f
font_04_sfnt_off00015dfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15DFB 6084 bytes
SHA-256: f5fe2de525700542684e23a11f1cb185b9ffab030677c6a48f3d5a1088c9e53b

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