Malicious PDF — malware analysis report

Static analysis result for SHA-256 6736fc482d0ae6b3…

MALICIOUS

PDF

79.8 KB Created: 2021-04-06 09:23:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 02e7c1d0bb8a073f1314b6ba69b85513 SHA-1: 5997e9a092e6742482111491ebf0ec79575f0f0b SHA-256: 6736fc482d0ae6b348b79f5ed65328c97c28b98e9f1463da14885d23567b8fb9
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a spearphishing attachment used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://botokaw.ru/strik?utm_term=meade+etx+105+price PDF link annotation
    • https://kubazabuz.weebly.com/uploads/1/3/4/8/134885093/nafikekofofeziz-kapekuzebuzola-gikapaliso.pdfIn PDF document text
    • https://zadobixif.weebly.com/uploads/1/3/1/4/131437920/basuguluwoki.pdfIn PDF document text
    • http://nububezobuto.22web.org/dawaxelixuragoju.pdfIn PDF document text
    • https://janogawe.weebly.com/uploads/1/3/0/7/130776821/1777647.pdfIn PDF document text
    • https://jowadukezivi.weebly.com/uploads/1/3/1/3/131379295/nipamew.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/189fd416-7fcb-48fb-8d93-edafc69f46e9/89469796139.pdfIn PDF document text
    • http://zipanuvazujejew.epizy.com/49876767216.pdfIn PDF document text
    • https://93641f3c-03d3-4c8c-b6db-0fd9bfabe798.filesusr.com/ugd/384ca7_6599c868e4c141989ea462bf258fb7c3.pdf?index=trueIn PDF document text
    • https://f50ece36-1901-4a7b-9396-968a400df7f4.filesusr.com/ugd/3ecb95_cb3000774ebc4f28954de7a40a59766f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/84fcc206-b2a2-4796-9148-6cb8a4ad3d2d/fipotisedunodurikonapu.pdfIn PDF document text
    • https://9c8f49e5-5895-4656-bc53-c560b1a0ede3.filesusr.com/ugd/0f7a6f_b2952f42018d440dacf35219afaef951.pdf?index=trueIn PDF document text
    • http://josatagosovux.rf.gd/cctv_camera_hacker_app.pdfIn PDF document text
    • https://17a6c5a8-0587-4adf-8126-5b439e15a62f.filesusr.com/ugd/54bec1_e052d53727094ca18fe8adb69f8ab4f6.pdf?index=trueIn PDF document text
    • https://c03439ef-6557-4199-865e-586791a52b6c.filesusr.com/ugd/6bb4a2_82659ad635a44b3a9609f6e140db87c1.pdf?index=trueIn PDF document text
    • http://burerekel.rf.gd/5266070242.pdfIn PDF document text
    • https://6f672a44-e16c-4921-a0f1-e3781c0647c5.filesusr.com/ugd/bda22a_5584b6cdf46b40829fa80d7e60fd1c02.pdf?index=trueIn 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_off0000f9a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9A6 5248 bytes
SHA-256: 3d0c9b2c8a036fbbd3c6a8cd85affd8b02ff796de456630d4f541bae1c58f24b
font_01_sfnt_off00010ba2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BA2 11336 bytes
SHA-256: 6ebc5bae4e1ea556c62b7d64c1706659a3e12f8edfa1dc0bfeecb936455ad346

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